CN114437702A - Auxiliary agent for fracturing fluid, fracturing fluid and preparation method - Google Patents

Auxiliary agent for fracturing fluid, fracturing fluid and preparation method Download PDF

Info

Publication number
CN114437702A
CN114437702A CN202011204592.0A CN202011204592A CN114437702A CN 114437702 A CN114437702 A CN 114437702A CN 202011204592 A CN202011204592 A CN 202011204592A CN 114437702 A CN114437702 A CN 114437702A
Authority
CN
China
Prior art keywords
fracturing fluid
parts
auxiliary agent
fracturing
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011204592.0A
Other languages
Chinese (zh)
Inventor
张斌
张德军
李凝
贾元钊
龙长俊
李玉涛
曾志国
王鹏
宁萌萌
蔡敬耀
曹景芝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Petrochina Co Ltd
Original Assignee
Petrochina Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Petrochina Co Ltd filed Critical Petrochina Co Ltd
Priority to CN202011204592.0A priority Critical patent/CN114437702A/en
Publication of CN114437702A publication Critical patent/CN114437702A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/66—Compositions based on water or polar solvents
    • C09K8/68—Compositions based on water or polar solvents containing organic compounds
    • 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
    • C09K8/84—Compositions based on water or polar solvents
    • C09K8/86—Compositions based on water or polar solvents containing organic compounds
    • 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
    • C09K8/84—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
    • C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
    • C09K8/905—Biopolymers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Cosmetics (AREA)

Abstract

The invention discloses an auxiliary agent for a fracturing fluid, the fracturing fluid and a preparation method, and belongs to the technical field of fracturing. The auxiliary agent comprises the following components in parts by weight: 10-20 parts of organic phosphate, 5-10 parts of potassium chloride, 8-15 parts of micromolecular aldehyde compound and 80-120 parts of purified water. When the auxiliary agent is used for preparing the fracturing fluid, the thickening agent can be dissolved in the fluid more quickly and sufficiently, and meanwhile, the auxiliary agent also has the functions of anti-swelling, sterilization and the like. When the auxiliary agent and oilfield produced water act synergistically, the prepared fracturing fluid has good fracturing performance and can meet the requirement of effective reconstruction of low-permeability and ultra-low-permeability reservoirs. The formula of the fracturing fluid is extremely simple, the cost of the fracturing fluid and the operation intensity of operators are obviously reduced, the production efficiency is improved, and effective technical support is provided for large-scale use of the fracturing fluid in water resource deficient areas and oil field produced water surplus areas.

Description

Auxiliary agent for fracturing fluid, fracturing fluid and preparation method
Technical Field
The invention relates to the technical field of fracturing, in particular to an auxiliary agent for a fracturing fluid, the fracturing fluid and a preparation method of the fracturing fluid.
Background
The fracturing modification technology is usually used for modifying low-permeability and ultra-low-permeability reservoirs, water-based fracturing fluid is usually used in the fracturing modification process, and the water-based fracturing fluid is prepared by using clear water, so that the fracturing modification technology has the characteristics of high safety, high construction success rate, stable performance of the fracturing fluid and the like. With the gradual depletion of clear water resources and the increasing of oil field produced water, more and more researches are currently carried out on the preparation of fracturing fluid by using oil field produced water.
Related art provides a fracturing fluid prepared from oilfield produced water, wherein a thickening agent xanthan gum, a cosolvent glycerol, an oxygen removal synergist and other additives are used, and a cross-linking agent is not used.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
the fracturing fluid provided by the related technology needs to be added with an oxygen removal synergist and other additives, the formula is complex, and the used oilfield produced water needs to be pretreated, so that the cost is increased.
Disclosure of Invention
In view of this, the invention provides an assistant for a fracturing fluid, a fracturing fluid and a preparation method thereof, which can solve the technical problems.
Specifically, the method comprises the following technical scheme:
on one hand, the embodiment of the invention provides an auxiliary agent for a fracturing fluid, which comprises the following components in parts by weight: 10-20 parts of organic phosphate, 5-10 parts of potassium chloride, 8-15 parts of micromolecular aldehyde compound and 80-120 parts of purified water.
In some possible implementations, the organophosphate is methyl phosphate and/or ethyl phosphate.
In some possible implementations, the small molecule aldehyde compound is formaldehyde and/or a multi-aldehyde compound.
In another aspect, embodiments of the present invention further provide a preparation method of any one of the above-mentioned auxiliaries for a fracturing fluid, where the preparation method includes: adding distilled water into a three-mouth flask according to the weight fraction of each component in the auxiliary agent;
and continuously adding potassium chloride, organic phosphate and a small molecular aldehyde compound into the three-mouth flask, stirring for a first set time, heating to a set temperature, keeping the temperature constant for a second set time, and cooling to obtain the auxiliary for the fracturing fluid.
In some possible implementations, the first set time is 8 minutes to 15 minutes.
In some possible implementations, the second set time is 1 hour to 3 hours.
In some possible implementations, the set temperature is 30 ℃ to 50 ℃.
In another aspect, an embodiment of the present invention further provides a fracturing fluid, where the fracturing fluid includes: thickening agent, oilfield produced water, and any one of the above additives for fracturing fluid;
wherein the thickening agent accounts for 0.2-1% of the fracturing fluid by mass;
the auxiliary agent accounts for 1-5% of the fracturing fluid by mass.
In some possible implementations, the thickening agent is hydroxypropyl guar or xanthan gum.
In another aspect, an embodiment of the present invention further provides a preparation method of any one of the fracturing fluids described above, where the preparation method of the fracturing fluid includes:
adding the oilfield produced water into a liquid preparation tank, adding an auxiliary agent into the liquid preparation tank, stirring uniformly, continuing to add a thickening agent into the liquid preparation tank, and continuing to stir uniformly to obtain the fracturing fluid.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
the auxiliary agent for the fracturing fluid provided by the embodiment of the invention comprises 10-20 parts of organic phosphate, 5-10 parts of potassium chloride, 8-15 parts of a small molecular aldehyde compound and 80-120 parts of purified water, and through the synergistic effect of the components, the auxiliary agent can enable a thickening agent to be dissolved in the fluid more quickly and sufficiently when the auxiliary agent is used for preparing the fracturing fluid, and meanwhile, the auxiliary agent also has the functions of anti-swelling, sterilization and the like. When the auxiliary agent and oilfield produced water act synergistically, the prepared fracturing fluid has good fracturing performance (for example, good expansion resistance and viscosity retention rate), and can meet the requirement of effective modification of low-permeability and ultra-low-permeability reservoirs. Therefore, when the auxiliary agent provided by the embodiment of the invention is utilized to cooperate with oilfield produced water to prepare the fracturing fluid, only a thickening agent is needed to be used, and other additives are not needed to be used, so that the formula of the fracturing fluid is extremely simple, the cost of the fracturing fluid and the operation intensity of operators are obviously reduced, the production efficiency is improved, and effective technical support is provided for large-scale use of the fracturing fluid in water resource deficient areas and oilfield produced water surplus areas.
Detailed Description
In order to make the technical solutions and advantages of the present invention more clear, embodiments of the present invention will be described in further detail below.
In one aspect, an embodiment of the present invention provides an auxiliary for a fracturing fluid, where the auxiliary includes the following components in parts by weight: 10-20 parts of organic phosphate, 5-10 parts of potassium chloride, 8-15 parts of micromolecular aldehyde compound and 80-120 parts of purified water.
In some possible implementations, the weight fraction of organophosphates includes, but is not limited to, the following: 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, and the like.
In some possible implementations, the weight fraction of potassium chloride includes, but is not limited to, the following: 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, and the like.
In some possible implementations, the weight fraction of the small molecule aldehyde compound includes, but is not limited to, the following: 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, and the like.
In some possible implementations, the weight fraction of organophosphates includes, but is not limited to, the following: 80 parts by weight, 85 parts by weight, 90 parts by weight, 95 parts by weight, 100 parts by weight, 105 parts by weight, 110 parts by weight, 115 parts by weight, 120 parts by weight, and the like.
The auxiliary agent for the fracturing fluid provided by the embodiment of the invention comprises 10-20 parts of organic phosphate, 5-10 parts of potassium chloride, 8-15 parts of a small molecular aldehyde compound and 80-120 parts of purified water, and through the synergistic effect of the components, the auxiliary agent can enable a thickening agent to be dissolved in the fluid more quickly and sufficiently when the auxiliary agent is used for preparing the fracturing fluid, and meanwhile, the auxiliary agent also has the functions of anti-swelling, sterilization and the like. When the auxiliary agent and oilfield produced water act synergistically, the prepared fracturing fluid has good fracturing performance (for example, good expansion resistance and viscosity retention rate), and can meet the requirement of effective modification of low-permeability and ultra-low-permeability reservoirs. Therefore, when the auxiliary agent provided by the embodiment of the invention is utilized to cooperate with the oilfield produced water to prepare the fracturing fluid, only the thickening agent is needed to be used, and other additives are not needed, so that the formula of the fracturing fluid is extremely simple, the cost of the fracturing fluid and the operation intensity of operators are obviously reduced, the production efficiency is improved, and effective technical support is provided for large-scale use of the fracturing fluid in water resource deficient areas and oilfield produced water surplus areas.
In some possible implementations, the organic phosphate is methyl phosphate and/or ethyl phosphate.
For example, the organic phosphate may be methyl phosphate, ethyl phosphate, or a mixture of methyl phosphate and ethyl phosphate, and the mass ratio of the two may be any ratio.
In some possible implementations, the auxiliary agent provided in the embodiments of the present invention includes a small aldehyde compound that is formaldehyde and/or a multi-aldehyde compound.
For example, the small-molecule aldehyde compound may be formaldehyde, or a polyaldehyde compound, or a mixture of formaldehyde and/or polyaldehyde compound, and the mass ratio of the two compounds may be any ratio, for example, the polyaldehyde compound may be valeraldehyde.
In another aspect, an embodiment of the present invention provides a preparation method of any one of the above-mentioned auxiliaries for a fracturing fluid, where the preparation method includes the following steps:
step 1, adding purified water into a three-mouth flask according to the weight fraction of each component in the auxiliary agent.
And 2, continuously adding potassium chloride, organic phosphate and a small molecular aldehyde compound into the three-mouth flask, stirring for a first set time, heating to a set temperature, keeping the temperature constant for a second set time, and cooling to obtain the auxiliary agent for the fracturing fluid.
According to the method provided by the embodiment of the invention, the auxiliary agent can be prepared through the steps, the operation is simple, the labor intensity of operators is reduced, and the operation efficiency is improved.
In some possible implementation manners, after the potassium chloride, the organic phosphate and the small-molecule aldehyde compound are continuously added into the three-mouth flask, stirring is carried out for a first set time, wherein the first set time is 8 minutes to 15 minutes, and stirring is carried out uniformly on the premise of ensuring that the operation efficiency is improved.
And continuously adding potassium chloride, organic phosphate and the micromolecular aldehyde compound into the three-mouth flask, stirring for 8-15 minutes, heating to the set temperature, and keeping the temperature for a second set time. Wherein the second set time is 1 hour to 3 hours to ensure that all components in the auxiliary agent are fully dissolved in the distilled water to obtain higher dispersion uniformity.
Further, the temperature after the temperature rise, that is, the above-mentioned set temperature is 30 ℃ to 50 ℃, for example, 30 ℃, 33 ℃, 35 ℃, 37 ℃, 38 ℃, 40 ℃, 41 ℃, 42 ℃, 43 ℃, 44 ℃, 45 ℃, 46 ℃, 47 ℃, 48 ℃, 49 ℃, 50 ℃ and the like, so as to ensure that each component in the auxiliary agent is sufficiently dissolved in the purified water.
In another aspect, an embodiment of the present invention further provides a fracturing fluid, including: a viscosifier, oilfield produced water, and any of the above-described adjuvants for fracturing fluids.
Wherein the thickening agent accounts for 0.2-1% of the fracturing fluid by mass; the auxiliary agent accounts for 1-5% of the fracturing fluid by mass (namely, the balance is oilfield produced water).
Based on the use of the auxiliary agent, when the auxiliary agent and oilfield produced water act synergistically, the prepared fracturing fluid has good fracturing performance (such as good expansion resistance and viscosity retention rate), and can meet the requirements of effective modification of low-permeability and ultra-low-permeability reservoirs. Therefore, when the auxiliary agent provided by the embodiment of the invention is utilized to cooperate with the oilfield produced water to prepare the fracturing fluid, only the thickening agent is needed to be used, and other additives are not needed, so that the formula of the fracturing fluid is extremely simple, the cost of the fracturing fluid and the operation intensity of operators are obviously reduced, the production efficiency is improved, and effective technical support is provided for large-scale use of the fracturing fluid in water resource deficient areas and oilfield produced water surplus areas.
In some possible implementations, the thickening agent is hydroxypropyl guar or xanthan gum, for example, the thickening agent is hydroxypropyl guar.
In another aspect, an embodiment of the present invention further provides a preparation method of any one of the fracturing fluids, where the preparation method of the fracturing fluid includes:
adding the oilfield produced water into a fluid preparation tank, adding an auxiliary agent into the fluid preparation tank, stirring uniformly, continuing to add a thickening agent into the fluid preparation tank, and continuing to stir uniformly to obtain the fracturing fluid.
The embodiment of the invention also provides a preparation method of the fracturing fluid, which is characterized in that the auxiliary agent is added into the produced water of the oil field in advance, the thickening agent is added after the auxiliary agent is uniformly stirred, other additives are not needed, the fluid preparation cost and the labor intensity are reduced, meanwhile, the fracturing fluid prepared by using the auxiliary agent has good anti-swelling property and viscosity retention rate, the fluid is neutral, the fluid preparation tank can be recycled, and the preparation method has the advantages of long quality guarantee period, clear water resource saving and the like.
The invention will be further described by the following specific examples:
example 1
The embodiment provides an auxiliary agent for a fracturing fluid, which comprises the following components in parts by weight: 10 parts of organic phosphate, 10 parts of potassium chloride, 12 parts of micromolecular aldehyde compound and 85 parts of purified water.
Wherein the organic phosphate is methyl phosphate; the micromolecular aldehyde compound is valeraldehyde.
The auxiliary agent for the fracturing fluid is prepared by the following method:
step 1, adding purified water into a three-mouth flask according to the weight fraction of each component in the auxiliary agent.
And 2, continuously adding potassium chloride, organic phosphate and a small molecular aldehyde compound into the three-mouth flask, stirring for 10 minutes, heating to 40 ℃, keeping the temperature for 2 hours, and cooling to room temperature to obtain uniform colorless transparent uniform liquid, namely the auxiliary agent for the fracturing fluid provided by the embodiment.
Example 2
The embodiment provides an auxiliary agent for a fracturing fluid, which comprises the following components in parts by weight: 12 parts of organic phosphate, 9 parts of potassium chloride, 13.5 parts of micromolecular aldehyde compound and 95 parts of distilled water.
Wherein the organic phosphate is methyl phosphate; the small-molecular aldehyde compound is a mixture of pentanal and formaldehyde (the ratio of the two is 1: 1).
The auxiliary agent for the fracturing fluid is prepared by the following method:
step 1, adding purified water into a three-mouth flask according to the weight fraction of each component in the auxiliary agent.
And 2, continuously adding potassium chloride, organic phosphate and a small molecular aldehyde compound into the three-mouth flask, stirring for 10 minutes, heating to 40 ℃, keeping the temperature for 2 hours, and cooling to room temperature to obtain uniform colorless transparent uniform liquid, namely the auxiliary agent for the fracturing fluid provided by the embodiment.
Example 3
The embodiment provides an auxiliary agent for a fracturing fluid, which comprises the following components in parts by weight: 13 parts of organic phosphate, 6 parts of potassium chloride, 12 parts of micromolecular aldehyde compound and 100 parts of distilled water.
Wherein the organic phosphate is ethyl phosphate; the micromolecular aldehyde compound is formaldehyde.
The auxiliary agent for the fracturing fluid is prepared by the following method:
step 1, adding distilled water into a three-mouth flask according to the weight fraction of each component in the auxiliary agent.
And 2, continuously adding potassium chloride, organic phosphate and a small molecular aldehyde compound into the three-mouth flask, stirring for 15 minutes, heating to 35 ℃, keeping the temperature for 3 hours, and cooling to room temperature to obtain uniform colorless transparent uniform liquid, namely the auxiliary agent for the fracturing fluid provided by the embodiment.
Example 4
The embodiment provides an auxiliary agent for a fracturing fluid, which comprises the following components in parts by weight: 11 parts of organic phosphate, 8 parts of potassium chloride, 12.5 parts of micromolecular aldehyde compound and 95 parts of distilled water.
Wherein the organic phosphate is ethyl phosphate; the small-molecular aldehyde compound is a mixture of pentanal and formaldehyde (the ratio of the two is 1: 2).
The auxiliary agent for the fracturing fluid is prepared by the following method:
step 1, adding distilled water into a three-mouth flask according to the weight fraction of each component in the auxiliary agent.
And 2, continuously adding potassium chloride, organic phosphate and a small molecular aldehyde compound into the three-mouth flask, stirring for 15 minutes, heating to 45 ℃, keeping the temperature for 1 hour, and cooling to room temperature to obtain uniform colorless transparent uniform liquid, namely the auxiliary agent for the fracturing fluid provided by the embodiment.
Example 5
The embodiment provides an auxiliary agent for a fracturing fluid, which comprises the following components in parts by weight: 20 parts of organic phosphate, 10 parts of potassium chloride, 14 parts of a small molecular aldehyde compound and 110 parts of purified water.
Wherein the organic phosphate is ethyl phosphate; the small-molecular aldehyde compound is a mixture of pentanal and formaldehyde (the ratio of the two is 1: 1).
The auxiliary agent for the fracturing fluid is prepared by the following method:
step 1, adding distilled water into a three-mouth flask according to the weight fraction of each component in the auxiliary agent.
And 2, continuously adding potassium chloride, organic phosphate and a small molecular aldehyde compound into the three-mouth flask, stirring for 10 minutes, heating to 50 ℃, keeping the temperature for 1 hour, and cooling to room temperature to obtain uniform colorless transparent uniform liquid, namely the auxiliary agent for the fracturing fluid provided by the embodiment.
Example 6
The embodiment of the invention also provides a fracturing fluid, which comprises: a viscosifier, oilfield produced water, and the adjuvant for a fracturing fluid provided in example 1. Wherein the thickening agent is hydroxypropyl guar gum, and the mass percentage of the thickening agent in the fracturing fluid is 1%; the auxiliary agent accounts for 5 percent of the mass of the fracturing fluid.
The fracturing fluid is prepared by the following method:
adding the oilfield produced water into a liquid preparation tank, then adding an auxiliary agent into the liquid preparation tank, stirring uniformly, continuing to add a thickening agent into the liquid preparation tank, and continuing to stir uniformly to obtain the fracturing fluid.
Example 7
The embodiment of the invention also provides a fracturing fluid, which comprises: a viscosifier, oilfield produced water, and the adjuvant for a fracturing fluid provided in example 2. Wherein the thickening agent is xanthan gum, and the mass percentage of the thickening agent in the fracturing fluid is 0.5%; the auxiliary agent accounts for 4 percent of the mass of the fracturing fluid.
The fracturing fluid is prepared by the following method:
adding the oilfield produced water into a fluid preparation tank, adding an auxiliary agent into the fluid preparation tank, stirring uniformly, continuing to add a thickening agent into the fluid preparation tank, and continuing to stir uniformly to obtain the fracturing fluid.
Example 8
The embodiment of the invention also provides a fracturing fluid, which comprises: a viscosifier, oilfield produced water, and the adjuvant for a fracturing fluid provided in example 3. Wherein the thickening agent is hydroxypropyl guar gum, and the mass percentage of the thickening agent in the fracturing fluid is 1%; the mass percentage of the auxiliary agent in the fracturing fluid is 4.5%.
The fracturing fluid is prepared by the following method:
adding the oilfield produced water into a fluid preparation tank, adding an auxiliary agent into the fluid preparation tank, stirring uniformly, continuing to add a thickening agent into the fluid preparation tank, and continuing to stir uniformly to obtain the fracturing fluid.
Example 9
The embodiment of the invention also provides a fracturing fluid, which comprises: viscosifier, oilfield produced water, and the adjuvant for fracturing fluids provided in example 4. Wherein the thickening agent is hydroxypropyl guar gum, and the thickening agent accounts for 0.7 percent of the fracturing fluid by mass; the mass percentage of the auxiliary agent in the fracturing fluid is 3.5%.
The fracturing fluid is prepared by the following method:
adding the oilfield produced water into a fluid preparation tank, adding an auxiliary agent into the fluid preparation tank, stirring uniformly, continuing to add a thickening agent into the fluid preparation tank, and continuing to stir uniformly to obtain the fracturing fluid.
Application example 1
Based on 100 parts by mass of the total solution of the fracturing fluid provided in example 6, a gel breaker accounting for 0.2 part by mass of the total solution is added, and the mixture is placed in a constant temperature box and kept at the constant temperature of 40 ℃ for 480min, so that the fracturing fluid is subjected to gel breaking at the constant temperature. The performance indexes of the fracturing fluid are measured and shown in the following table 1, and the table 1 is the performance index of the fracturing fluid prepared from the oilfield produced water at the temperature of 40 ℃.
TABLE 1
Figure BDA0002756568920000081
As can be seen from the table 1, under the condition of 40 ℃, all indexes of the fracturing fluid prepared by the method can reach the industrial standard, wherein the damage rate of the matrix permeability of the rock core is less than 20 percent and is better than 30 percent of the damage rate specified in SY/T5107-2016 water-based fracturing fluid performance evaluation method; the residue content after gel breaking is 200mg/L, which is superior to 600mg/L in the industry standard; the swelling prevention rate of the gel breaking liquid is 96 percent and is superior to 85 percent of the industry standard. Therefore, the fracturing fluid prepared by the method provided by the embodiment of the invention has good performances and obvious application effect.
Application example 2
Based on 100 parts by mass of the total solution of the fracturing fluid provided in example 7, a gel breaker accounting for 0.1 part by mass of the total solution is added, and the mixture is placed in a constant temperature box and kept at the temperature of 60 ℃ for 600min, so that the fracturing fluid is subjected to gel breaking at the constant temperature. The performance indexes of the fracturing fluid are measured and shown in the following table 2, and the table 2 is the performance index of the fracturing fluid prepared from the oilfield produced water at the temperature of 60 ℃.
TABLE 2
Figure BDA0002756568920000091
As can be seen from the table 2, under the condition of 60 ℃, all indexes of the fracturing fluid prepared by the method can reach the industrial standard, wherein the damage rate of the matrix permeability of the rock core is 13 percent and is superior to 30 percent specified in SY/T5107-2016 water-based fracturing fluid performance evaluation method; the residue content after gel breaking is 150mg/L, which is superior to 600mg/L in the industry standard; the anti-swelling rate of the gel breaking liquid is 93 percent and is better than 85 percent of the industry standard. Therefore, the fracturing fluid prepared by the method provided by the embodiment of the invention has good performances and obvious application effect.
Application example 3
Based on 100 parts by mass of the total solution of the fracturing fluid provided in example 8, a gel breaker accounting for 0.12 part by mass of the total solution is added, and the mixture is placed in a constant temperature box and kept at the temperature of 110 ℃ for 480min, so that the fracturing fluid is subjected to gel breaking at the constant temperature. The performance indexes of the fracturing fluid are measured and shown in the following table 3, and the table 3 is the performance index of the fracturing fluid prepared from the oilfield produced water at the temperature of 110 ℃.
TABLE 3
Figure BDA0002756568920000101
As can be seen from Table 3, under the condition of 110 ℃, all indexes of the fracturing fluid prepared by the method can reach the industrial standard, wherein the damage rate of the matrix permeability of the rock core is 18 percent and is better than 30 percent of that specified in SY/T5107-2016 water-based fracturing fluid performance evaluation method; the residue content after gel breaking is 160mg/L, which is superior to 600mg/L in the industry standard; the anti-swelling rate of the gel breaking liquid is 94 percent and is better than 85 percent of the industry standard. Therefore, the fracturing fluid prepared by the method provided by the embodiment of the invention has good performances and obvious application effect.
Application example 4
In the application example, the fracturing fluid of the example 9 is applied to carry out field tests, the fracturing well section of a test well (Hongkong oil field, G78-52 wells) is 2954.7m-3004m, and the fracturing fluid is pumped and injected by 27m3Proppant 25m3And the construction displacement is 3.3m3And/min. The results show that the daily oil production before the well pressure is 1.9m3D, oil production 12m in the early days after well pressure3And d, compared with the conventional fracturing fluid, the fracturing effect is obvious.
Further, when the fracturing fluid flowback fluid of the test well is degritted and deoiled by a physical method and then used again as water for preparing the fracturing fluid, the fracturing fluid is prepared according to the method for preparing the fracturing fluid in example 9, and the viscosity-temperature performance of the fracturing fluid is measured. The result shows that the viscosity-temperature performance of the fracturing fluid prepared by adopting the flow-back filtrate is consistent with that of the original produced water; furthermore, the temperature is kept for 480min at the temperature of 110 ℃, the viscosity of the gel breaking liquid after gel breaking is 1.6mPa & s, the content of residue is 180mg/L, and good performance is still maintained.
The above description is only for the convenience of understanding the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The auxiliary agent for the fracturing fluid is characterized by comprising the following components in parts by weight: 10-20 parts of organic phosphate, 5-10 parts of potassium chloride, 8-15 parts of micromolecular aldehyde compound and 80-120 parts of purified water.
2. The adjuvant for fracturing fluids according to claim 1, wherein the organic phosphate is methyl phosphate and/or ethyl phosphate.
3. The adjuvant for fracturing fluids according to claim 1, wherein the small molecule aldehyde based compound is formaldehyde and/or a multi-aldehyde based compound.
4. A method of preparing an adjuvant for use in a fracturing fluid as claimed in any one of claims 1 to 3, comprising: adding distilled water into a three-mouth flask according to the weight fraction of each component in the auxiliary agent;
and continuously adding potassium chloride, organic phosphate and a small molecular aldehyde compound into the three-mouth flask, stirring for a first set time, heating to a set temperature, keeping the temperature constant for a second set time, and cooling to obtain the auxiliary for the fracturing fluid.
5. The method of preparing an adjuvant for use in a fracturing fluid of claim 4, wherein the first set time is 8 minutes to 15 minutes.
6. The method of preparing an adjuvant for use in a fracturing fluid of claim 4, wherein the second set time is 1 hour to 3 hours.
7. The method of preparing an adjuvant for use in a fracturing fluid of claim 4, wherein the set temperature is 30 ℃ to 50 ℃.
8. A fracturing fluid, comprising: a thickener, oilfield produced water, and the adjuvant for a fracturing fluid of any one of claims 1 to 3;
wherein the thickening agent accounts for 0.2-1% of the fracturing fluid by mass;
the auxiliary agent accounts for 1-5% of the fracturing fluid by mass.
9. The fracturing fluid of claim 8, wherein the viscosifying agent is hydroxypropyl guar or xanthan gum.
10. The method of preparing the fracturing fluid of claim 8 or 9, comprising:
adding the oilfield produced water into a liquid preparation tank, adding an auxiliary agent into the liquid preparation tank, stirring uniformly, continuing to add a thickening agent into the liquid preparation tank, and continuing to stir uniformly to obtain the fracturing fluid.
CN202011204592.0A 2020-11-02 2020-11-02 Auxiliary agent for fracturing fluid, fracturing fluid and preparation method Pending CN114437702A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011204592.0A CN114437702A (en) 2020-11-02 2020-11-02 Auxiliary agent for fracturing fluid, fracturing fluid and preparation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011204592.0A CN114437702A (en) 2020-11-02 2020-11-02 Auxiliary agent for fracturing fluid, fracturing fluid and preparation method

Publications (1)

Publication Number Publication Date
CN114437702A true CN114437702A (en) 2022-05-06

Family

ID=81357199

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011204592.0A Pending CN114437702A (en) 2020-11-02 2020-11-02 Auxiliary agent for fracturing fluid, fracturing fluid and preparation method

Country Status (1)

Country Link
CN (1) CN114437702A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030092584A1 (en) * 2001-11-13 2003-05-15 Crews James B. Deep water completions fracturing fluid compositions
CN110872507A (en) * 2018-08-29 2020-03-10 思达斯易能源技术(集团) 有限公司 Non-crosslinked fracturing fluid, preparation method and application thereof and non-crosslinked fracturing fluid thickener

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030092584A1 (en) * 2001-11-13 2003-05-15 Crews James B. Deep water completions fracturing fluid compositions
CN110872507A (en) * 2018-08-29 2020-03-10 思达斯易能源技术(集团) 有限公司 Non-crosslinked fracturing fluid, preparation method and application thereof and non-crosslinked fracturing fluid thickener

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
何静等: "多糖胶水溶液黏度影响因素比较", 《非常规油气》 *
何静等: "多糖胶水溶液黏度影响因素比较", 《非常规油气》, vol. 4, no. 2, 30 April 2017 (2017-04-30), pages 109 - 113 *
刁素等: "致密砂岩气藏水平井不动管柱不限级数体积压裂先导试验", 《2016 年天然气学术年会》, vol. 1, pages 179 - 5 *
许明标等主编: "《聚合物在油气田开采中的应用》", 31 January 2010, 中国地质大学出版社, pages: 222 *

Similar Documents

Publication Publication Date Title
US6214773B1 (en) High temperature, low residue well treating fluids and methods
US4215001A (en) Methods of treating subterranean well formations
CN102634328B (en) Carboxymethyl hydroxypropyl guanidine gum fracturing fluid
US20060205607A1 (en) Methods of treating subterranean zones and viscous aqueous fluids containing xanthan and a combination cross-linker-breaker
CN102757778B (en) Fracturing fluid capable of resisting high salinity water quality
US20120270760A1 (en) Boron Crosslinkers For Fracturing Fluids With Appreciably Lower Polymer Loading
CN102732244B (en) Cross-linking agent for fracturing fluid with ultralow hydroxypropyl guar concentration and fracturing fluid prepared from cross-linking agent
EP0962626A2 (en) Treating subterranean formations
US20070256836A1 (en) Methods of treating a subterranean formation with a treatment fluid having surfactant effective to increase the thermal stability of the fluid
CN102127415A (en) Low-damage super guargum fracturing fluid
US7000702B2 (en) Environmentally benign viscous well treating fluids and methods
CN111040752B (en) Low-adsorption fracturing fluid system and preparation method thereof
MXPA06001786A (en) Polymer crosslinking system.
CN106590609A (en) Fracturing fluid and preparation method thereof
CN102676146B (en) Super guanidine gum fracturing fluid
CN113652222B (en) Temperature-resistant salt-tolerant anionic surfactant clean fracturing fluid and preparation method thereof
CA2741273A1 (en) Boron crosslinkers for fracturing fluids with appreciably lower polymer loading and related methods and compositions
CN109852365A (en) Prepare method, the guanidine gum fracturing fluid by this method preparation and its application of guanidine gum fracturing fluid
CN102134481B (en) Carboxymethyl-hydroxypropyl guar gum water-base fracturing fluid
CN106753312B (en) Preparation method of fiber slickwater fracturing fluid
CN114437702A (en) Auxiliary agent for fracturing fluid, fracturing fluid and preparation method
CN103232840B (en) A kind of high density fracturing liquid and compound method thereof
CN111594124A (en) Shallow tight oil reservoir imbibition fracturing method, fracturing system for shallow tight oil reservoir and discharge-free imbibition fracturing fluid
US11655412B2 (en) Spherical organic nano boron crosslinker with PAMAM core and preparation method thereof, and gel fracturing fluid
CN113025299B (en) Water-based guanidine gum fracturing fluid synergist and preparation method and application thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination