CN113388383B - Chelating regulator and application thereof - Google Patents
Chelating regulator and application thereof Download PDFInfo
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- CN113388383B CN113388383B CN202110671558.2A CN202110671558A CN113388383B CN 113388383 B CN113388383 B CN 113388383B CN 202110671558 A CN202110671558 A CN 202110671558A CN 113388383 B CN113388383 B CN 113388383B
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Abstract
The invention relates to a chelating regulator and application thereof, wherein the chelating regulator comprises the following components in parts by weight: 63-69 parts of water, 24-29 parts of chelating agent and 7-9 parts of organic amine pH regulator; the chelating agent comprises a combination of an organic phosphate chelating agent and a carboxylic acid chelating agent. The chelating regulator disclosed by the invention is simple in component and can be used in a fracturing fluid prepared from high-salinity water.
Description
Technical Field
The invention relates to the technical field of fracturing fluid of oil and gas fields, in particular to a chelating regulator and application thereof.
Background
The fracturing technology can improve the seepage condition of an oil-gas layer, improve the index of oil extraction gas and improve the productivity of an oil-gas well, and is an important production increasing measure for developing a low-permeability oil-gas field. The fracturing fluid is an important component of a fracturing technology, has functions of making cracks and carrying sand, and the success of fracturing operation depends on the quality of the fracturing fluid to a great extent. The fracturing fluid widely applied at present is a freshwater-based guanidine gum fracturing fluid, is suitable for low-medium-high temperature strata, and has the advantages of good rheological property, strong fracture forming capability, large sand adding scale and obvious yield increasing effect.
With the increase of the development of fracturing, the use of the fresh water-based fracturing fluid has the following problems: (1) The fracturing construction is short in fresh water resources, the water consumption of a single well in the fracturing construction is generally more than 500, and large-scale fracturing construction is often limited in areas short in fresh water resources and brings certain pressure to local water sources; (2) Due to environmental protection factors, the fracturing flowback fluid produced in large quantity is difficult to store, the treatment cost is high, and the method is difficult to adapt to large-scale fracturing operation which is rapidly increased in the future. In summary, if highly mineralized water such as seawater, fracturing flowback water, etc. is used to directly prepare fracturing fluid, the above problems will be effectively solved, and the method becomes an important fracturing fluid preparation method in the future.
When the high salinity water such as seawater or fracturing flowback water is used for preparing the fracturing fluid, the high salinity water has high salinity and is rich in various high-valence metal ions, and when the water is used for preparing the alkaline cross-linked fracturing fluid, the reaction of the high-valence metal ions and alkaline substances is easy to occur, so that firstly, a mixture of various crystal or amorphous solid precipitates can be formed to cause damage to a reservoir stratum, secondly, the alkaline substances are consumed by calcium and magnesium ions to cause the reduction of a pH value, the cross-linking performance of the fracturing fluid is influenced, the temperature resistance of the fracturing fluid is reduced, the sand carrying performance is deteriorated, and the high salinity water is a main adverse factor in the fracturing construction safety. The chelating regulator can shield or reduce the concentration of multivalent mineral ions in high salinity water through chelating and the like, and can continuously maintain an alkaline crosslinking environment, so that the aims of enhancing the temperature resistance and shearing resistance of the fracturing fluid and reducing reservoir damage are fulfilled.
CN109135713A discloses a clean fracturing fluid for high salinity produced water and a preparation method thereof, wherein the disclosed clean fracturing fluid comprises the following components in percentage by weight: 1.5 to 3 percent of YSR-1 type viscoelastic surfactant, 0.1 to 0.5 percent of pH regulator, 0.01 to 0.05 percent of chelating agent and the balance of produced water; wherein the YSR-1 type viscoelastic surfactant comprises fatty amide betaine, fatty acid and solvent. The disclosed clean fracturing fluid reduces the requirements of the fracturing fluid on water quality, but has higher requirements on chelating components and pH value adjusting components.
CN103131405A discloses a high temperature seawater base fracturing fluid suitable for a formation temperature of 160 ℃ and a preparation method thereof, the disclosed high temperature seawater base fracturing fluid is prepared by reacting a base fluid and a cross-linking agent, and the disclosed base fluid comprises the following raw materials in parts by weight: 96-98 parts of seawater; 0.5-1.0 part of thickening agent; 0.8-1.5 parts of a chelating regulator; 0.3-1.0 part of temperature stabilizer; 0.1-0.5 part of surfactant; 0.01-0.05 part of gel breaker; the disclosed cross-linking agent is 0.5-1.5 weight parts, and the disclosed high-temperature seawater-based fracturing fluid has good compatibility with seawater and Ca in seawater 2+ 、Mg 2+ 、Fe 3+ The high-valence and variable-valence metal ions have good tolerance and good complexation, can overcome or reduce the damage caused by secondary precipitation, but the water quality mainly aims at seawater and surface mineralization water, and the water quality mainly aims at Ca 2+ The content is less than 1000mg/L, mg 2+ The content is less than 2000mg/L.
In view of the foregoing, it is important to develop a chelating modifier that is simple in composition and can be used in fracturing fluids formulated with highly mineralized water.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a chelating regulator which has simple components and can be used in fracturing fluid prepared from highly mineralized water, and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a chelating regulator, which comprises the following components in parts by weight: 63-69 parts of water, 24-29 parts of chelating agent and 7-9 parts of organic amine pH regulator;
the chelating agent comprises a combination of an organic phosphate chelating agent and a carboxylic acid chelating agent.
The chelating agent in the chelating regulator is mainly used for inhibiting a large amount of precipitation and scaling of metal ions such as calcium, magnesium and the like in hypersalinity water in an alkaline crosslinking environment of the fracturing fluid, the pH value regulator is mainly used for providing and maintaining the alkaline crosslinking environment required by the crosslinking of the fracturing fluid, and the chelating agent and the organic amine pH regulator can be fully matched under a small using amount, so that the damage caused by secondary precipitation can be overcome and reduced, and the condition of the crosslinking pH value of the fracturing fluid can be met.
The organic phosphoric acid chelating agent and the carboxylic acid chelating agent can play a synergistic role, the organic phosphoric acid chelating agent can induce the crystals such as calcium carbonate and the like to generate serious lattice distortion, an electric double layer is formed near a crystal nucleus, the growth of precipitated particles is prevented, the main effect is mainly played in high-hardness heavy-duty water, the carboxylic acid chelating agent can prevent the growth of water scales with different hardness through the chelating effect, the two synergistic effects make up the defects of a single type of chelating agent, and the range of the application water quality is enlarged.
Under the environment that highly mineralized water exists in a large amount of calcium and magnesium ions, if pH value regulators such as inorganic alkali are added, a large amount of precipitates can be generated, the number of hydroxyl groups is consumed, the compatibility of the fracturing fluid and a stratum is influenced, the pH value of the fracturing fluid is reduced, the crosslinking performance can be influenced, and the organic amine pH regulator can not cause too high local concentration of the hydroxyl groups due to the fact that the speed of the hydroxyl groups released in the water is low, so that the problems can be solved, and a higher pH value environment can be provided.
The chelating agent and the organic amine pH regulator are used in combination, the obtained chelating regulator can be suitable for water quality with different mineralization degrees, such as seawater, fracturing flowback treated water and the like, the application range of the prior art which is only suitable for the mineralization degree of seawater is broken through, and Ca in the water quality with different mineralization degrees, such as seawater, fracturing flowback water and the like 2+ 、Mg 2+ 、Fe 3+ The high-valence and variable-valence metal ions have tolerance and good complexation, can overcome and reduce the damage caused by secondary precipitation, simultaneously meet the condition of the crosslinking pH value of the fracturing fluid, and meet the requirements of the fracturing fluid on temperature resistance and shearing resistance.
The water accounts for 63-69 parts by weight, such as 64 parts, 65 parts, 66 parts, 67 parts, 68 parts and the like.
The chelating agent is 24-28 parts by weight, such as 25 parts, 26 parts, 27 parts and the like.
The organic amine pH value regulator is 7-9 parts by weight, such as 7.5 parts, 8 parts, 8.5 parts and the like.
Preferably, the organic phosphate chelating agent comprises any one of or a combination of at least two of sodium diethylenetriamine penta (DTPMPA-Na), sodium ethylene diamine tetra (methylene) phosphate, or sodium 1-hydroxyethylene-1,1-diphosphate, wherein typical but non-limiting combinations include: a combination of sodium diethylenetriamine penta (methylene phosphonic acid) phosphate and sodium ethylenediamine tetra (methylene phosphonic acid) phosphate, a combination of sodium ethylenediamine tetra (methylene phosphonic acid) phosphate and 1-hydroxyethylidene-1,1-sodium diphosphate, a combination of sodium diethylenetriamine penta (methylene phosphonic acid) phosphate, sodium ethylenediamine tetra (methylene phosphonic acid) phosphate and 1-hydroxyethylidene-1,1-sodium diphosphate, and the like, with sodium diethylenetriamine penta (methylene phosphonic acid) phosphate being preferred.
Preferably, the carboxylic acid chelating agents include aminocarboxylic acid chelating agents and/or non-aminocarboxylic acid chelating agents, preferably a combination of aminocarboxylic acid chelating agents and non-aminocarboxylic acid chelating agents.
The non-aminocarboxylic acid chelating agent is preferably a polycarboxylic acid chelating agent, the aminocarboxylic acid chelating agent mainly prevents the calcium and magnesium ions from precipitating and growing through chelation, and mainly plays a main role in medium-and-low-hardness water, the polycarboxylic acid chelating agent mainly prevents the scale from growing through preventing the interaction and agglomeration of scale forming particles, and mainly plays a main role in medium-and-high-hardness water, and the polycarboxylic acid chelating agent have synergistic effect, so that the defect of a single type of chelating agent is overcome, and the range of the application water quality is expanded.
Preferably, the aminocarboxylic acid type chelating agent includes sodium ethylenediaminetetraacetate (EDTA-Na) and/or sodium ethylenediaminediorthohydroxyphenylmacrocetate ((EDDHA-Na).
Preferably, the non-aminocarboxylic acid based chelating agent comprises maleic acid-acrylic acid copolymer (MA-AA).
Preferably, the chelating agent comprises a combination of sodium ethylenediaminetetraacetate (EDTA-Na), sodium diethylenetriaminepenta-phosphate (DTPMPA-Na), sodium ethylenediamine diorthohydroxyphenyl diacetate ((EDDHA-Na) and a copolymer of maleic acid-acrylic acid (MA-AA).
Preferably, the chelating agent comprises the following components in parts by weight: 16 to 22 parts (for example, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, etc.) of sodium ethylenediaminetetraacetate pentakisphosphate, 4 to 6 parts (for example, 4.5 parts, 5 parts, 5.5 parts, etc.) of sodium ethylenediaminetetraacetate (for example, 4.5 parts, 5 parts, 5.5 parts, etc.) and 0.001 to 0.005 part (for example, 0.002 parts, 0.003 parts, 0.004 parts, etc.) of a copolymer of maleic acid-acrylic acid.
Preferably, the organic amine pH adjuster includes any one or a combination of at least two of ethanolamine, ethylenediamine, or triethanolamine.
Preferably, the organic amine pH regulator comprises the following components in parts by weight: 3-5 parts (e.g., 3.5 parts, 4 parts, 4.5 parts, etc.) of ethanolamine, 2-4 parts (e.g., 2.5 parts, 3 parts, 3.5 parts, etc.) of ethylenediamine, and 1-2 parts (e.g., 1.2 parts, 1.5 parts, 1.8 parts, etc.) of triethanolamine.
As a preferred technical scheme, the chelating regulator comprises the following components in parts by weight: 63-69 parts of water, 16-22 parts of sodium ethylene diamine tetracetate, 4-6 parts of sodium diethylenetriamine penta (methylene phosphate), 4-6 parts of sodium ethylenediamine di-o-hydroxyphenyl diacetate, 0.001-0.005 part of maleic acid-acrylic acid copolymer, 3-5 parts of ethanolamine, 2-4 parts of ethylenediamine and 1-2 parts of triethanolamine.
In a second aspect, the present invention provides a fracturing fluid comprising a chelating modifier as described in the first aspect.
The chelating regulator is applied at a suitable temperature range of 30-90 ℃, and the ion concentration range in water is applicable as follows: ca 2+ ：1500-3000mg/L，Mg 2+ ：1500-3000mg/L。
Compared with the prior art, the invention has the following beneficial effects:
the chelating regulator of the invention gives a formula suitable for water quality with different mineralization degrees such as seawater, fracturing flowback treated water and the like, breaks through the application range only suitable for the mineralization degree of seawater in the prior art, and can be used for Ca in water quality with different mineralization degrees such as seawater, fracturing flowback water and the like 2+ 、Mg 2+ 、Fe 3+ The high-valence and variable-valence metal ions have tolerance and good complexation, and can overcome the defect of high-valence and variable-valence metal ionsThe damage caused by secondary precipitation is reduced, the condition of the crosslinking pH value of the fracturing fluid is met, the requirements of temperature resistance and shearing resistance of the fracturing fluid are met, and the fracturing fluid has the characteristic of small using amount. The Ca content can be adjusted within the range of 30-90 DEG C 2+ The concentration is 1500-3000Mg/L and Mg 2+ The pH value of the highly mineralized water with the concentration of 1500-3000mg/L is more than 10, the turbidity of the water is less than 30NTU, and concretely, the turbidity of the water is less than 22.10.
Drawings
FIG. 1 is a graph showing the effect of the fracturing fluids described in application example 1 and application comparative example 1 on the rheological properties of a seawater-based fracturing fluid at 160 ℃.
FIG. 2 is a graph showing the application effect of the fracturing fluid described in application example 2 and application comparative example 2 in the preparation of rheological property of the fracturing fluid by fracturing flow-back treatment water at 90 ℃.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a chelating regulator, which consists of the following components in parts by weight: 63 parts of fresh water, 20 parts of EDTA-Na,4 parts of DTPMPA-Na,4 parts of EDDHA-Na,0.003 part of MA-AA, 7 parts of ethanolamine and 2 parts of ethylenediamine.
Example 2
The embodiment provides a chelating regulator, which is composed of the following components in parts by weight: 63 parts of fresh water, 20 parts of EDTA-Na,6 parts of EDDHA-Na,2 parts of DTPMPA-Na,7 parts of ethanolamine and 2 parts of ethylenediamine.
Example 3
The embodiment provides a chelating regulator, which is composed of the following components in parts by weight: 65 parts of fresh water, 18 parts of EDTA-Na,6 parts of EDDHA-Na,4 parts of DTPMPA-Na,0.5 part of ethylene diamine tetramethylene sodium phosphate, 0.2 part of 1-hydroxyethylene-1,1-sodium diphosphate, 0.005 part of MA-AA and 7 parts of ethanolamine.
Examples 4 to 5
Examples 4 to 5 are different from example 1 in that the chelating agent is 24 parts by weight (specifically, composition: 20 parts of EDTA-Na,2 parts of DTPMPA-Na,1.997 parts of EDDHA-Na,0.003 parts of MA-AA) and 29 parts by weight (specifically, composition: 24 parts of EDTA-Na,2 parts of DTPMPA-Na,2.995 parts of EDDHA-Na,0.005 parts of MA-AA), respectively.
Example 6
This example differs from example 1 in that the organic amine type pH adjusting agent is 7 parts by weight (5.4 parts by weight and 1.6 parts by weight of ethanolamine and ethylenediamine, respectively).
Example 7
This example is different from example 1 in that it does not contain MA-AA, and the weight portion of EDTA-Na is 20.003, and the rest is the same as example 1.
Comparative example 1
This comparative example differs from example 1 in that the chelating agent is 28.003 parts by weight of EDTA-Na, the remainder being the same as example 1.
Comparative example 2
This comparative example is different from example 1 in that the chelating agent is 28.003 parts by weight of DTPMPA-Na, and the rest is the same as example 1.
Comparative example 3
This comparative example differs from example 1 in that the chelating agent is 28.003 parts by weight of MA-AA, and the remainder is the same as example 1.
Comparative example 4
The comparative example is different from example 1 in that the pH regulator is NaOH with equal weight part, and the rest is the same as example 1.
Comparative examples 5 to 6
Comparative examples 5 to 6 are different from example 1 in that the chelating agents are 21 parts by weight (specific composition: 18 parts of EDTA-Na,1 part of DTPMPA-Na,1.997 parts of EDDHA-Na,0.003 parts of MA-AA) and 32 parts by weight (specific composition: 26 parts of EDTA-Na,3 parts of DTPMPA-Na,2.997 parts of EDDHA-Na,0.003 parts of MA-AA), respectively.
Comparative examples 7 to 8
Comparative examples 7 to 8 are different from example 1 in that the organic amine-based pH adjusting agent is 5 parts by weight (specific composition: 3.9 parts by weight and 1.1 parts by weight of ethanolamine and ethylenediamine, respectively) and 11 parts by weight (specific composition: 8.6 parts by weight and 2.4 parts by weight of ethanolamine and ethylenediamine, respectively).
Application example 1
The embodiment also provides a fracturing fluid prepared from seawater, and the fracturing fluid consists of the following components in parts by weight: 98.5 parts of base fluid, 1.0 part of cross-linking agent (organic boron zirconium cross-linking agent, available from Cheng Hao petrochemical company, nyoklu, with the mark of XT-1H) and 0.5 part of chelating regulator (0.5 percent by mass) in example 2;
the base liquid comprises the following components in parts by weight: 0.55 part of sulfonic modified guar gum (purchased from Cheng Hao petrochemical company, inc., of Ningchu city, with the trade name of XT-06H), 0.2 part of bactericide (purchased from Cheng Hao petrochemical company, inc., of Ningchu city, with the trade name of WJ-11H), 0.4 part of demulsification cleanup additive (purchased from Cheng Hao petrochemical company, of Ningchu city, with the trade name of HP-08H), 1 part of temperature stabilizer (purchased from Cheng Hao petrochemical company, of Ningchu city, with the trade name of XT-40H), and the balance of seawater, wherein the components of the seawater are shown in Table 1:
TABLE 1
Application example 2
The embodiment also provides a fracturing fluid prepared by utilizing the fracturing flow-back treatment water, and the fracturing fluid consists of the following components in parts by weight: 99.4 parts of base liquid, 0.3 part of cross-linking agent (organic boron cross-linking agent, purchased from Tongying Co-Tai chemical Limited liability company, with the mark of XT-9) and 0.3 part of chelating regulator (0.3 percent by mass) in example 3;
the base liquid comprises the following components in parts by weight: 0.35 part of hydroxypropyl guar gum (purchased from Cheng Hao petrochemical company, namely SH-1), 0.2 part of bactericide (purchased from Tongguan Tongtai chemical company, namely XT-11), 0.5 part of cleanup additive (purchased from Dongguan Tongtai chemical company, namely XT-05), 0.5 part of clay stabilizer (purchased from Dongguan Tongtai chemical company, namely XT-06), and the balance of fracturing flowback treatment water, wherein the components of the fracturing flowback treatment water are shown in Table 2:
TABLE 2
Application comparative example 1
The comparative example of the present application is different from application example 2 in that the chelate regulator is replaced with an equal part by weight of NaOH.
Comparative application example 2
The comparative application example differs from application example 3 in that the chelate regulator is replaced with an equal part by weight of NaOH.
Performance testing
Examples 1 to 7, comparative examples 1 to 8, application examples 1 to 2 and application comparative examples 1 to 2 were subjected to the following tests:
1. for example 1:
(1) Preparation of Ca-containing substance from distilled water 2+ 1500～3000mg/L，Mg 2+ 1500-3000mg/L of highly mineralized water;
(2) Adding the chelating regulator into the high-salinity water, and testing the pH value and the turbidity of the high-salinity water by using a Turb550 turbidity tester and a precise pH meter;
(3) Placing the high-salinity water in a water bath kettle, keeping the temperature of 90 ℃ for 4h, and then testing the pH value and the turbidity of the high-salinity water by using a Turb550 turbidity tester and a precision pH meter;
the test results are summarized in table 3.
TABLE 3
As can be seen from Table 3, ca is contained after the chelate regulator is added at room temperature 2+ 1500～3000mg/L，Mg 2+ 1500～3000mg/The pH of the highly mineralized water L can be adjusted to above 10 and the turbidity is less than 10NTU, specifically, the turbidity is below 1.17 NTU; after being kept at 90 ℃ for 4h, the pH value of the system can be adjusted to be more than 10 and the turbidity is less than 30NTU, and specifically, the turbidity is below 14.0 NTU.
4. For examples 1-7 and comparative examples 1-8
(1) Preparation of Ca-containing substance from distilled water 2+ 3000mg/L，Mg 2+ 3000mg/L of high salinity water;
(2) Adding 0.25% of chelating regulator into the hypersalinity water, and testing the pH value and turbidity of the hypersalinity water by using a Turb550 turbidity tester and a precise pH meter;
(3) Placing the high-salinity water in a water bath kettle, keeping the temperature of 90 ℃ for 4h, and then testing the pH value and the turbidity of the high-salinity water by using a Turb550 turbidity tester and a precision pH meter;
the test results are summarized in table 4.
TABLE 4
Analysis of the data in Table 4 reveals that Ca content can be adjusted within the range of 30 ℃ to 90 ℃ 2+ The concentration is 1500-3000Mg/L and Mg 2 + The pH value of the highly mineralized water with the concentration of 1500-3000mg/L is more than 10, the turbidity of the water is less than 30NTU, and concretely, the turbidity of the water is less than 22.10.
As can be seen by analyzing example 1, example 7 and comparative examples 1 to 3 are inferior in performance to example 1, and the use of a plurality of chelating agents in combination is proved to be advantageous in performance when the chelating regulator is used, particularly the use of an organic phosphoric acid chelating agent, an amino carboxylic acid chelating agent and a non-amino carboxylic acid chelating agent in combination is selected.
As can be seen from the analysis of example 1 and comparative example 4, comparative example 4 is inferior in performance to example 1, demonstrating that the chelate regulator obtained using the organic amine type pH regulator performs better in application.
As is clear from the analysis of examples 4 to 5 and comparative examples 5 to 6, comparative example 5 is inferior in performance to examples 4 to 5, and comparative example 6 is slightly superior in performance to examples 4 to 5, but from the economical point of view, the chelating agent is not necessarily more than 29 parts by weight, demonstrating that the chelating agent in the range of 24 to 29 parts by weight is excellent in overall performance in application.
As can be seen from the analysis of examples 1 and 6 and comparative examples 7 to 8, comparative examples 7 to 8 are inferior in performance to example 1, and it is confirmed that the chelate regulator obtained in the range of 7 to 9 parts by weight of the pH regulator is superior in performance in application.
3. For application example 1 and application comparative example 1:
dynamic rheology testing of the fracturing fluid was performed at 160 ℃. The test instrument was a HAAKE RS-6000 rotational viscometer. At constant shear rate (170 s) -1 ) Next, the apparent viscosity change of the jelly was tested over 120 min.
The test results are shown in fig. 1.
As can be seen from figure 1, the chelating regulator is not added in the fracturing fluid, the fracturing fluid has poor temperature resistance and shear resistance, and the viscosity is reduced to below 50mPa & s within 30 min. After the chelating regulator is added, the fracturing fluid is sheared for 120min at 160 ℃, and the viscosity is still more than 100mPa & s. In the embodiment, the fracturing fluid uses a boron-zirconium cross-linking agent, the cross-linking reaction mainly occurs in an alkaline environment, and the result of fig. 1 shows that the addition of the chelating regulator not only provides the pH value required by the cross-linking of the fracturing fluid, but also can stabilize the pH value of the system in a proper range by stabilizing high-valence calcium and magnesium ions and avoiding the consumption of the calcium and magnesium ions on hydroxyl, thereby increasing the temperature resistance and the shear resistance of the fracturing fluid.
4. For application example 2 and application comparative example 2:
dynamic rheology testing of the fracturing fluid was performed at 90 ℃. The test instrument was a HAAKE RS-6000 rotational viscometer. At constant shear rate (170 s) -1 ) Next, the change in apparent viscosity of the jelly within 120min was tested.
The test results are shown in fig. 2.
As can be seen from figure 2, the fracturing fluid does not contain a chelating regulator, has poor temperature resistance and shear resistance, and the viscosity is reduced to below 50mPa & s within about 80 min. After the chelating regulator is added, the fracturing fluid is sheared for 110min at the temperature of 90 ℃, and the viscosity is still about 300 mPas. In the embodiment, the fracturing fluid uses a boron crosslinking agent, the crosslinking reaction mainly occurs in an alkaline environment, and the result of fig. 2 shows that the addition of the chelating regulator not only provides the pH value required by the crosslinking of the fracturing fluid, but also can stabilize the pH value of the system in a proper range by stabilizing high-valence calcium and magnesium ions and avoiding the consumption of the calcium and magnesium ions on hydroxyl, thereby increasing the temperature resistance and the shearing resistance of the fracturing fluid.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (7)
1. The chelating regulator is characterized by comprising the following components in parts by weight: 63-69 parts of water, 24-29 parts of chelating agent and 7-9 parts of organic amine pH regulator;
the chelating agent comprises a combination of an organic phosphate chelating agent and a carboxylic acid chelating agent;
the organic phosphoric acid chelating agent comprises any one or the combination of at least two of diethylenetriamine pentamethylene sodium phosphate, ethylene diamine tetramethylene sodium phosphate or 1-hydroxyethylidene-1,1-sodium diphosphate;
the carboxylic acid chelating agents include combinations of aminocarboxylic acid chelating agents and non-aminocarboxylic acid chelating agents;
the aminocarboxylic acid chelating agent comprises sodium ethylenediamine tetracetate and/or sodium ethylenediamine-di-o-hydroxyphenyl diacetate;
the non-aminocarboxylic acid chelating agent includes a maleic acid-acrylic acid copolymer.
2. The chelant of claim 1, wherein the chelating agent comprises a combination of sodium ethylenediaminetetraacetate, sodium diethylenetriaminepentamethylenephosphate, sodium ethylenediaminediorthohydroxyphenylmacrocetate, and a copolymer of maleic acid-acrylic acid.
3. The chelating regulator of claim 2, wherein the chelating agent comprises the following components in parts by weight: 16-22 parts of sodium ethylene diamine tetracetate, 4-6 parts of sodium diethylenetriamine pentamethylene phosphate, 4-6 parts of sodium ethylenediamine-di-o-hydroxyphenyl diacetate and 0.001-0.005 part of maleic acid-acrylic acid copolymer.
4. The chelating regulator as set forth in claim 1, wherein the organic amine-based pH regulator comprises any one or a combination of at least two of ethanolamine, ethylenediamine or triethanolamine.
5. The chelating regulator of claim 4, wherein the organic amine pH regulator comprises the following components in parts by weight: 3-5 parts of ethanolamine, 2-4 parts of ethylenediamine and 1-2 parts of triethanolamine.
6. The chelating regulator of claim 1, wherein the chelating regulator comprises the following components in parts by weight: 63-69 parts of water, 16-22 parts of sodium ethylene diamine tetracetate, 4-6 parts of diethylenetriamine pentamethylene sodium phosphate, 4-6 parts of ethylenediamine-di-o-hydroxyphenyl sodium diacetate, 0.001-0.005 part of maleic acid-acrylic acid copolymer, 3-5 parts of ethanolamine, 2-4 parts of ethylenediamine and 1-2 parts of triethanolamine.
7. A fracturing fluid comprising the chelating modifier of any of claims 1 to 6.
Priority Applications (1)
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| US20100000579A1 (en) * | 2008-07-03 | 2010-01-07 | Reinbold Robert S | Compositions And Methods For Removing Scale And Inhibiting Formation Thereof |
| CN102757778B (en) * | 2012-08-14 | 2014-06-04 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Fracturing fluid capable of resisting high salinity water quality |
| CN103131405B (en) * | 2013-03-20 | 2015-03-25 | 中国海洋石油总公司 | High-temperature sea water-base fracturing liquid suitable for formation temperature of 160 DEG C and preparation method thereof |
| CN104556337B (en) * | 2013-10-14 | 2017-06-16 | 陕西太昱科技发展有限公司 | One kind suppresses screener |
| CN106928958A (en) * | 2016-12-22 | 2017-07-07 | 陕西延长石油（集团）有限责任公司（延长油矿管理局）油气勘探公司 | A kind of oil-gas field fracturing special chelant |
| CN109135713A (en) * | 2018-09-05 | 2019-01-04 | 安徽炎胜新材料科技有限公司 | A kind of clean fracturing fluid and preparation method thereof for high salinity recovered water |
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