CN111394087A - Preparation method of non-oxidative gel breaker for fracturing - Google Patents
Preparation method of non-oxidative gel breaker for fracturing Download PDFInfo
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- CN111394087A CN111394087A CN202010343784.3A CN202010343784A CN111394087A CN 111394087 A CN111394087 A CN 111394087A CN 202010343784 A CN202010343784 A CN 202010343784A CN 111394087 A CN111394087 A CN 111394087A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/24—Bacteria or enzyme containing gel breakers
Abstract
The invention relates to a preparation method of a non-oxidative gel breaker for fracturing, which comprises the following components in parts by weight: 15-18 parts of guanidine gum glucoside bond specific hydrolase, 1-5 parts of a chain scission agent, 3-8 parts of a synergist, 5-10 parts of a salt material and 50-100 parts of water. The preparation method comprises the following steps: mixing the materials in parts by weight, and uniformly mixing the synergist, the salt and water; adding guanidine gum glucoside bond specific hydrolase into the mixed solution obtained in the step (1), heating to 40-45 ℃ at a speed of 4-8 ℃/min while stirring, stirring at a constant temperature for 1-2 h, heating to 50-65 ℃ at a speed of 1-3 ℃/min, stirring at a constant temperature for 2-3 h, and cooling to room temperature; and (3) adding the chain scission agent into the mixed solution obtained in the step (2) to obtain the product. The gel breaker has good gel breaking performance on the guanidine gum fracturing fluid at the temperature of 25-85 ℃, and has the characteristics of safe and convenient field operation, no corrosion to equipment and the like.
Description
Technical Field
The invention relates to a gel breaker, and in particular relates to a preparation method of a non-oxidative gel breaker for fracturing.
Background
Fracturing is a method of forming cracks in oil and gas layers by utilizing the action of water power in the process of oil extraction or gas production, and is also called hydraulic fracturing. Fracturing is the process of artificially cracking stratum, improving the flowing environment of oil in underground and increasing the yield of oil well, and plays an important role in improving the flowing condition of oil well bottom, slowing down the interlamination and improving the oil layer utilization condition. In the fracturing construction process, a high-viscosity fracturing fluid is pumped into a stratum by using a high-pressure pump set, a seam is formed and a propping agent is carried, a gel breaker is added into the fracturing fluid in advance, the gel breaker does not influence the fracturing fluid before stopping pumping (closing the seam), and then the gel breaker is rapidly reacted with the fracturing fluid to reduce the molecular weight and the brix of a polymer so as to be rapidly discharged.
The gel breaker mainly destroys the molecular chain structure of the thickening agent, reduces viscosity and hydrates the thickening agent, and realizes gel breaking. The gel breaking is realized mainly through the ways of heat, machinery, chemistry, biology and the like. The common methods are a biological method and a chemical method, wherein the chemical method mainly adopts oxidants such as potassium persulfate, ammonium persulfate and the like, and when the temperature is high, the peroxide is decomposed into high-activity free radicals to destroy the main chain structure of the polymer, thereby achieving the purpose of gel breaking. Oxidative breakers suffer from a number of drawbacks, such as: the high-temperature fracturing fluid can react with the fracturing fluid quickly at high temperature, so that the fracturing fluid is degraded in advance and loses the capability of conveying the proppant, even the fracturing construction fails, and the high-temperature fracturing fluid can react with any encountered reactant such as a pipe, a stratum matrix, hydrocarbon and the like to generate pollutants. The biological enzyme gel breaker is an environment-friendly gel breaker, obviously improves the reduction of gel breaking residues, but loses the activity of enzyme under the conditions of high temperature and high pH value, and further loses the gel breaking capability.
Disclosure of Invention
In view of the above, there is a need to provide a preparation method of a non-oxidative breaker for fracturing, which has the advantages of stable performance, controllable gel breaking time, complete gel breaking, and the like, in order to solve the problems in the prior art.
The technical scheme of the invention is as follows:
in a first aspect, the invention provides a non-oxidative breaker for fracturing, which comprises the following components in parts by weight: 15-18 parts of guanidine gum glucoside bond specific hydrolase, 1-5 parts of a chain scission agent, 3-8 parts of a synergist, 5-10 parts of a salt material and 50-100 parts of water.
Further, the chain scission agent comprises the following components in percentage by weight: 10% of sodium dodecyl sulfate, 5% of polypropylene glycol, 3% of sodium silicate, 5% of potassium carboxylate, 10% of imidazoline corrosion inhibitor and the balance of water.
Further, the synergist is selected from one of ammonium citrate, sodium gluconate and sodium tartrate.
Further, the salt material is prepared from sodium aluminate, ferric trichloride and magnesium chloride according to the mass ratio of 3: 4: 1 are mixed.
Further, the gel breaker further comprises 10-15 parts of a dispersing agent and 20-50 parts of a cosolvent.
Further, the dispersant is selected from tween or SP.
Further, the cosolvent is selected from one or more of methanol, n-butanol and o-methylphenol.
Further, the gel breaker also comprises 1-10 parts of a corrosion inhibitor.
Further, the corrosion inhibitor is prepared from cinnamaldehyde and hexamethylenetetramine according to a mass ratio of 1: 3, and mixing the components in a ratio of 3.
In a second aspect, the invention provides a preparation method of the gel breaker, which comprises the following steps:
(1) mixing the materials in parts by weight, and uniformly mixing the synergist, the salt and water;
(2) adding guanidine gum glucoside bond specific hydrolase into the mixed solution obtained in the step (1), heating to 40-45 ℃ at a speed of 4-8 ℃/min while stirring, stirring at a constant temperature for 1-2 h, heating to 50-65 ℃ at a speed of 1-3 ℃/min, stirring at a constant temperature for 2-3 h, and cooling to room temperature;
(3) and (3) adding the chain scission agent into the mixed solution obtained in the step (2) to obtain the product.
Further, the gel breaker further comprises a dispersing agent and a cosolvent, and the preparation method further comprises the step of adding the dispersing agent and the cosolvent into the mixed liquor obtained in the step (3).
Further, the gel breaker also comprises a corrosion inhibitor, and the preparation method further comprises the step of adding the corrosion inhibitor into the mixed liquor obtained in the step (3).
In a third aspect, the invention provides a gel breaking method of the gel breaker in a fracturing process, which comprises the following steps:
and adding the gel breaker according to the mass percentage of 5-10% of the gel breaker in the fracturing fluid.
The invention has the beneficial effects that: the gel breaker has good gel breaking performance on the guanidine gum fracturing fluid at the temperature of 25-85 ℃, and the product can replace a gel breaking system of potassium persulfate and an initiator at low temperature; when the gel breaker is used, the gel breaker is directly added into base fluid of fracturing fluid, controllable delayed fracture gel breaking of polymer gel is realized by changing the adding concentration of the gel breaker, polymer molecules do not reunite after gel breaking, the viscosity does not increase, and filter cakes are thoroughly removed; obviously improves the stratum permeability to increase the oil and gas yield and avoids the damage to the stratum permeability caused by incomplete gel breaking of the secondary addition of the reducing agent. In addition, the gel breaker has the characteristics of safe and convenient field operation, no corrosion to equipment and the like.
Detailed Description
In the description of the present invention, it is to be noted that those whose specific conditions are not specified in the examples are carried out according to the conventional conditions or the conditions recommended by the manufacturers. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Example 1
The embodiment provides a non-oxidative breaker for fracturing, which comprises the following components in parts by weight: 15 parts of guanidine gum glucoside bond specific hydrolase, 1 part of chain scission agent, 5 parts of ammonium citrate, 5 parts of salt and 74 parts of water. Wherein the chain scission agent comprises the following components in percentage by weight: 10% of sodium dodecyl sulfate, 5% of polypropylene glycol, 3% of sodium silicate, 5% of potassium carboxylate, 10% of imidazoline corrosion inhibitor and the balance of water. The salt material is prepared from sodium aluminate, ferric trichloride and magnesium chloride according to the mass ratio of 3: 4: 1 are mixed.
The preparation method of the gel breaker comprises the following steps:
(1) mixing the materials according to the parts by weight, namely uniformly mixing the ammonium citrate, the salt material and the water;
(2) adding guanidine gum glucoside bond specific hydrolase into the mixed solution in the step (1), heating to 45 ℃ from 20 ℃ at a speed of 5 ℃/min while stirring, stirring at a constant temperature for 1h, heating to 60 ℃ at a speed of 3 ℃/min, stirring at a constant temperature for 2h, and cooling to room temperature;
(3) and (3) adding the chain scission agent into the mixed solution obtained in the step (2) to obtain the product.
Example 2
The embodiment provides a non-oxidative breaker for fracturing, which comprises the following components in parts by weight: 18 parts of guar gum glucoside bond specific hydrolase, 2 parts of a chain scission agent, 5 parts of sodium gluconate, 8 parts of a salt material and 67 parts of water. Wherein the chain scission agent comprises the following components in percentage by weight: 10% of sodium dodecyl sulfate, 5% of polypropylene glycol, 3% of sodium silicate, 5% of potassium carboxylate, 10% of imidazoline corrosion inhibitor and the balance of water. The salt material is prepared from sodium aluminate, ferric trichloride and magnesium chloride according to the mass ratio of 3: 4: 1 are mixed.
The gel breaker was prepared as in example 1.
Example 3
The embodiment provides a non-oxidative breaker for fracturing, which comprises the following components in parts by weight: 18 parts of guar gum glucoside bond specific hydrolase, 3 parts of a chain scission agent, 3 parts of ammonium citrate, 5 parts of a salt material, 10 parts of SP, 20 parts of methanol and 41 parts of water. Wherein the chain scission agent comprises the following components in percentage by weight: 10% of sodium dodecyl sulfate, 5% of polypropylene glycol, 3% of sodium silicate, 5% of potassium carboxylate, 10% of imidazoline corrosion inhibitor and the balance of water. The salt material is prepared from sodium aluminate, ferric trichloride and magnesium chloride according to the mass ratio of 3: 4: 1 are mixed.
The preparation method of the gel breaker comprises the following steps:
(1) mixing the materials in parts by weight, namely uniformly mixing ammonium citrate, salt materials, water and methanol;
(2) adding guanidine gum glucoside bond specific hydrolase into the mixed solution in the step (1), heating to 45 ℃ from 20 ℃ at a speed of 5 ℃/min while stirring, stirring at a constant temperature for 1h, heating to 60 ℃ at a speed of 3 ℃/min, stirring at a constant temperature for 2h, and cooling to room temperature;
(3) and (3) adding a chain scission agent and SP into the mixed solution obtained in the step (2) to obtain the product.
Example 4
The embodiment provides a non-oxidative breaker for fracturing, which comprises the following components in parts by weight: 16 parts of guanidine gum glucoside bond specific hydrolase, 5 parts of a chain breaking agent, 3 parts of sodium tartrate, 10 parts of salt, 3 parts of a corrosion inhibitor and 63 parts of water. Wherein the chain scission agent comprises the following components in percentage by weight: 10% of sodium dodecyl sulfate, 5% of polypropylene glycol, 3% of sodium silicate, 5% of potassium carboxylate, 10% of imidazoline corrosion inhibitor and the balance of water. The salt material is prepared from sodium aluminate, ferric trichloride and magnesium chloride according to the mass ratio of 3: 4: 1 are mixed. The corrosion inhibitor is prepared from cinnamaldehyde and hexamethylenetetramine according to a mass ratio of 1: 3, and mixing the components in a ratio of 3.
The preparation method of the gel breaker comprises the following steps:
(1) mixing the materials in parts by weight, namely uniformly mixing the sodium tartrate, the salt material and the water;
(2) adding guanidine gum glucoside bond specific hydrolase into the mixed solution in the step (1), heating from 18 ℃ to 42 ℃ at the speed of 6 ℃/min while stirring, stirring at constant temperature for 1h, heating to 63 ℃ at the speed of 3 ℃/min, stirring at constant temperature for 2h, and cooling to room temperature;
(3) adding a chain scission agent into the mixed solution in the step (2);
(4) and (4) finally adding a corrosion inhibitor into the mixed solution obtained in the step (3) to obtain the corrosion inhibitor.
Example 5
The embodiment provides a non-oxidative breaker for fracturing, which comprises the following components in parts by weight: 15 parts of guanidine gum glucoside bond specific hydrolase, 1 part of a chain scission agent, 4 parts of sodium tartrate, 6 parts of a salt material, 10 parts of tween, 25 parts of o-cresol, 5 parts of a corrosion inhibitor and 34 parts of water. Wherein the chain scission agent comprises the following components in percentage by weight: 10% of sodium dodecyl sulfate, 5% of polypropylene glycol, 3% of sodium silicate, 5% of potassium carboxylate, 10% of imidazoline corrosion inhibitor and the balance of water. The salt material is prepared from sodium aluminate, ferric trichloride and magnesium chloride according to the mass ratio of 3: 4: 1 are mixed. The corrosion inhibitor is prepared from cinnamaldehyde and hexamethylenetetramine according to a mass ratio of 1: 3, and mixing the components in a ratio of 3.
The preparation method of the gel breaker comprises the following steps:
(1) mixing the materials in parts by weight, namely uniformly mixing the sodium tartrate, the salt material, the water and the o-cresol;
(2) adding guanidine gum glucoside bond specific hydrolase into the mixed solution in the step (1), heating to 45 ℃ from 20 ℃ at a speed of 5 ℃/min while stirring, stirring at a constant temperature for 1.5h, heating to 55 ℃ at a speed of 2 ℃/min, stirring at a constant temperature for 3h, and cooling to room temperature;
(3) adding a chain scission agent and tween into the mixed solution in the step (2);
(4) and (4) finally adding a corrosion inhibitor into the mixed solution obtained in the step (3) to obtain the corrosion inhibitor.
Comparative example 1
This comparative example provides a breaker that differs from example 1 by: contains no specific hydrolase of guanidine gum glucoside bond. The preparation method of the gel breaker comprises the following steps:
(1) mixing materials, namely uniformly mixing ammonium citrate, salt materials and water;
(2) and (3) adding a chain scission agent into the mixed solution obtained in the step (1) to obtain the modified polyester.
Comparative example 2
This comparative example provides a breaker that differs from example 1 by: does not contain a chain scission agent. The preparation method of the gel breaker comprises the following steps:
the preparation method of the gel breaker comprises the following steps:
(1) firstly, uniformly mixing ammonium citrate, salt materials and water;
(2) adding guanidine gum glucoside bond specific hydrolase into the mixed solution obtained in the step (1), heating to 45 ℃ from 20 ℃ at a speed of 5 ℃/min while stirring, stirring at a constant temperature for 1h, heating to 60 ℃ at a speed of 3 ℃/min, stirring at a constant temperature for 2h, and cooling to room temperature to obtain the product.
Comparative example 3
This comparative example provides a breaker that differs from example 1 by: does not contain synergist and salt.
The preparation method of the gel breaker comprises the following steps:
the preparation method of the gel breaker comprises the following steps:
(1) adding specific hydrolase of guar gum glucoside bond into water, heating to 45 deg.C from 20 deg.C at a speed of 5 deg.C/min under stirring, stirring at constant temperature for 1h, heating to 63 deg.C at a speed of 8 deg.C/min, stirring at constant temperature for 2h, and cooling to room temperature;
(2) and (3) adding the chain scission agent into the mixed solution obtained in the step (2) to obtain the product.
Gel breaker performance evaluation test
Preparing base slurry of fracturing fluid: adding polymeric ferric aluminum chloride into the oilfield well site wastewater for flocculation, adding sodium carbonate to adjust the pH value to about 7, adding PHP, standing for 20min, adding a 15% guanidine gum solution, uniformly mixing, wherein the addition of the guanidine gum solution is 2% of the mass ratio of the guanidine gum in the fracturing fluid base slurry, so as to obtain the fracturing fluid base slurry, and measuring the viscosity of the base slurry to be 58mPa & s by using a viscometer.
And (3) taking 9 equal parts of the fracturing fluid base slurry, respectively adding the gel breakers of examples 1-5 and comparative examples 1-3 and a commercially available guanidine gum glucoside bond specific hydrolase gel breaker, wherein the addition amount accounts for 5% of the mass ratio of the gel breakers in the fracturing fluid base slurry, and then inspecting the performance indexes of the gel breakers of various cases for 40min at the conditions of 25 ℃, 45 ℃, 65 ℃ and 85 ℃.
TABLE 1 gel breaker Performance of the breaker at various temperatures
As can be seen from the data in Table 1, the gel breaker provided by the invention has better gel breaking performance at the gel breaking time of 25 ℃, 45 ℃, 65 ℃, 85 ℃ and 40min, the performance of the gel breaker is obviously superior to that of the guanidine gum glucoside bond specific hydrolase gel breaker sold in the comparative example and the market, the viscosity reduction effect on the fracturing fluid is obvious, and the effective treatment of the fracturing fluid can be realized.
The influence of different addition mass concentrations of the gel breaker on the viscosity of the fracturing fluid (the temperature is 45 ℃ and the gel breaking time is 40min) is also examined by using the fracturing fluid base slurry, and the results are shown in table 2.
TABLE 2 concentrations of breaker addition
As can be seen from the data in Table 2, with the increase of the addition of the gel breaker, the gel breaking effect of the gel breaker on the base slurry of the fracturing fluid is improved on the whole, but after the addition of the gel breaker is increased to 5%, the improvement of the effect is relatively slow, and therefore, the addition of the gel breaker is determined to be 5-10%.
The gel breaker has good gel breaking performance on the guanidine gum fracturing fluid at the temperature of 25-85 ℃, and the product can replace a gel breaking system of potassium persulfate and an initiator at low temperature; when the gel breaker is used, the gel breaker is directly added into base fluid of fracturing fluid, controllable delayed fracture gel breaking of polymer gel is realized by changing the adding concentration of the gel breaker, polymer molecules do not reunite after gel breaking, the viscosity does not increase, and filter cakes are thoroughly removed; obviously improves the stratum permeability to increase the oil and gas yield and avoids the damage to the stratum permeability caused by incomplete gel breaking of the secondary addition of the reducing agent. In addition, the gel breaker has the characteristics of safe and convenient field operation, no corrosion to equipment and the like.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A non-oxidative breaker for fracturing, characterized in that: the composition in parts by weight is as follows: 15-18 parts of guanidine gum glucoside bond specific hydrolase, 1-5 parts of a chain scission agent, 3-8 parts of a synergist, 5-10 parts of a salt material and 50-100 parts of water.
2. The non-oxidative breaker for fracturing of claim 1, wherein: the chain scission agent comprises the following components in percentage by weight: 10% of sodium dodecyl sulfate, 5% of polypropylene glycol, 3% of sodium silicate, 5% of potassium carboxylate, 10% of imidazoline corrosion inhibitor and the balance of water.
3. The non-oxidative breaker for fracturing of claim 1, wherein: the synergist is selected from one of ammonium citrate, sodium gluconate and sodium tartrate.
4. The non-oxidative breaker for fracturing of claim 1, wherein: the salt material is prepared from sodium aluminate, ferric trichloride and magnesium chloride according to the mass ratio of 3: 4: 1 are mixed.
5. The non-oxidative breaker for fracturing as claimed in any one of claims 1 to 4, wherein: the gel breaker further comprises 10-15 parts of a dispersing agent and 20-50 parts of a cosolvent.
6. The non-oxidative breaker for fracturing as claimed in any one of claims 1 to 4, wherein: the gel breaker also comprises 1-10 parts of a corrosion inhibitor.
7. The method for preparing a non-oxidative breaker for fracturing of any one of claims 1 to 4, wherein: the method comprises the following steps:
(1) mixing materials, namely uniformly mixing the synergist, the salt and water;
(2) adding guanidine gum glucoside bond specific hydrolase into the mixed solution obtained in the step (1), heating to 40-45 ℃ at a speed of 4-8 ℃/min while stirring, stirring at a constant temperature for 1-2 h, heating to 50-65 ℃ at a speed of 1-3 ℃/min, stirring at a constant temperature for 2-3 h, and cooling to room temperature;
(3) and (3) adding the chain scission agent into the mixed solution obtained in the step (2) to obtain the product.
8. The method for preparing the non-oxidative breaker for fracturing as claimed in claim 7, wherein: the gel breaker further comprises a dispersing agent and a cosolvent, and the preparation method further comprises the step of adding the dispersing agent and the cosolvent into the mixed liquor obtained in the step (3).
9. The method for preparing the non-oxidative breaker for fracturing as claimed in claim 7, wherein: the gel breaker also comprises a corrosion inhibitor, and the preparation method further comprises the step of adding the corrosion inhibitor into the mixed liquid obtained in the step (3).
10. The method for breaking the non-oxidative fracturing gel breaker of any one of claims 1 to 6 in a fracturing process; the method comprises the following steps: and adding the gel breaker according to the mass percentage of 5-10% of the gel breaker in the fracturing fluid.
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| CN116970382A (en) * | 2023-09-22 | 2023-10-31 | 东营市宝泽能源科技有限公司 | Gel breaker for oilfield fracturing and preparation method thereof |
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| CN116218499A (en) * | 2023-05-08 | 2023-06-06 | 胜利油田胜华实业有限责任公司 | Targeted gel breaker for oil field and preparation method thereof |
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