CN115785939B - Acidizing and fracturing fluid for oil and gas exploitation and preparation method thereof - Google Patents
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Abstract
The invention relates to the technical field of thickened oil recovery, and particularly discloses an acid fracturing fluid for oil and gas recovery and a preparation method thereof. The acidizing fracturing fluid comprises the following components in parts by weight: 100 parts of water, 0.2 to 0.45 part of thickening agent, 0.2 to 0.8 part of fracturing drainage assistant, 0.15 to 0.27 part of metal ion chelating agent, 0.5 to 1.1 parts of iron ion stabilizer and 15 to 25 parts of acid liquor. Wherein: the iron ion stabilizer is prepared by the following steps: uniformly mixing thionyl chloride liquid, binder powder and expanded graphite, and granulating; and then coating the surface of the granulated particles with molten paraffin liquid to form a paraffin coating layer, and cooling the coating layer to obtain the iron ion stabilizer. The acidified fracturing fluid contains a novel iron ion stabilizer, not only can reduce iron ions into ferrous ions to improve the difficulty of formation of precipitates, but also can supplement hydrogen ions to the acidified fracturing fluid to reduce the formation of iron ion precipitates.
Description
Technical Field
The invention relates to the technical field of thickened oil recovery, in particular to an acid fracturing fluid for oil and gas recovery and a preparation method thereof.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Oil and gas recovery processes in which the formation is squeezed into an acidizing fracturing fluid at a pressure sufficient to fracture or open the original fractures of the formation are known as frac-acidizing. The wall surface of the crack is corroded into an uneven surface by the corrosion action of the acid liquor in the acid fracturing process, and the wall surface of the crack cannot be completely closed after the pump is stopped and the pressure is relieved, so that an oil-gas channel with a flow guide effect is formed, and the production capacity of an oil well can be well improved. However, iron ions, ferrous ions and the like are inevitably generated in the process of corrosion of minerals in the stratum by the acidizing fracturing fluid, and for the iron ions, precipitates begin to form when the pH of the system is greater than 2, especially the pH rises along with continuous consumption of hydrogen ions in the acidizing fracturing fluid, so that favorable conditions are created for the iron ions to form precipitates, and the formed cracks are easily blocked and blocked along with the accumulation of the precipitates, so that the fracturing effect is influenced, and further the oil and gas exploitation efficiency is influenced.
The traditional method for overcoming the problems is mainly to add iron ion stabilizers such as citric acid or sodium citrate with lower cost into the acidified fracturing fluid. However, citric acid is easy to form calcium citrate with low solubility product with calcium ions in the stratum, and the substance is also easy to deposit to cause the blockage and the blockage of the cracks formed after the stratum is fractured. However, if the concentration of citric acid in the acidified fracturing fluid is reduced, the requirement for iron ion stability is difficult to meet. Therefore, the traditional acidizing fracturing fluid still has a plurality of defects in the actual use process, and the construction effect and the oil and gas exploitation efficiency are influenced.
Disclosure of Invention
In view of the above, the invention provides an acid fracturing fluid for oil and gas exploitation and a preparation method thereof. The acidified fracturing fluid contains a novel iron ion stabilizer, and not only can reduce iron ions into ferrous ions to improve the difficulty of formation of precipitates, but also can supplement hydrogen ions to the acidified fracturing fluid to destroy the formation conditions of the precipitates. In order to achieve the above object, the present invention discloses the following technical solutions.
The invention discloses an oil gas exploitation acidizing fracturing fluid which comprises the following components in parts by weight: 100 parts of water, 0.2 to 0.45 part of thickening agent, 0.2 to 0.8 part of fracturing drainage assistant, 0.15 to 0.27 part of metal ion chelating agent, 0.5 to 1.1 parts of iron ion stabilizer and 15 to 25 parts of acid liquor. Wherein: the iron ion stabilizer is prepared by the following steps: uniformly mixing the thionyl chloride liquid, the binder powder and the expanded graphite, and then granulating. And then coating the surface of the granulated particles with molten paraffin liquid to form a paraffin coating layer, and cooling the coating layer to obtain the iron ion stabilizer.
Further, the thickener includes: acacia, hydroxymethyl cellulose, hydroxypropyl cellulose, sodium carboxymethyl cellulose, and carboxymethyl hydroxypropyl guar gum. The thickening agent has the main functions of increasing the viscosity of the acidizing fracturing fluid, limiting the reaction degree of hydrogen ions and the stratum, enabling the acid liquor to reach deeper stratum and increasing the acidizing penetration distance.
Further, the fracturing cleanup additive comprises: a fluorocarbon surfactant, a siloxane surfactant, a fatty alcohol polyether compound, a fatty alcohol polyether and cationic surfactant compound, and the like. The cleanup additive has the main functions of reducing the surface tension of water and improving the flowback speed and the flowback degree of the acidizing fracturing fluid.
Further, the acidizing fracturing fluid also comprises 1~3 parts by weight of corrosion inhibitor. The corrosion inhibitor mainly has the functions of forming a protective film on the surface of metal, preventing acid from contacting with the metal and reducing the corrosion of acidizing fracturing fluid on underground oil pipes, casings, some metal facilities and the like. Optionally, the corrosion inhibitor comprises: any one of mannich base corrosion inhibitor, imidazoline corrosion inhibitor and the like.
Further, the metal ion chelating agent includes: citric acid, citrate, etc. which can sequester metal ions such as ferric ions, ferrous ions, etc. produced in the formation, reduce the concentration of free metal ions, and reduce the formation of precipitates.
Further, the acid solution is prepared from hydrochloric acid, hydrofluoric acid and acetic acid according to a mass ratio of 3.5 to 5:1.6 to 2.1:2.8 to 3.4, respectively. Optionally, the mass fraction of the hydrochloric acid is 15 to 20%, the mass fraction of the hydrofluoric acid is 3~5%, and the mass fraction of the acetic acid is 5 to 10%.
Further, the proportion of the thionyl chloride liquid, the binder powder and the expanded graphite is 10 to 15 parts by weight: 23 to 27 parts by weight: 4~7 parts by weight. Wherein: the particle size of the expanded graphite is 200-300 meshes. The binder comprises any one of starch, polyvinyl alcohol, carboxymethyl cellulose, cyclodextrin and the like.
Further, the ratio of the paraffin liquid to the particles is 2.5 to 4 parts by weight: 10 to 15 parts by weight. The particle size of the particles obtained by granulation is 0.5-1.5 mm, and the particle size of the particles can be selected according to actual needs, which is not described in detail herein. Preferably, the temperature of the paraffin liquid is not higher than 60 ℃, such as 60 to 50 ℃ and the like.
In a second aspect, the invention discloses a preparation method of the oil and gas exploitation acidizing fracturing fluid, which comprises the following steps: the fracturing cleanup additive, the metal ion chelating agent and/or the corrosion inhibitor are added into water and stirred uniformly, and then the thickening agent is added and stirred uniformly to form the thickened fracturing fluid. When the viscous fracturing fluid is used, the viscous fracturing fluid is injected into a stratum to make a crack, and then the acid liquid and the iron ion stabilizer are added into the crack to erode the crack.
Compared with the prior art, the invention has the beneficial effects of at least the following aspects:
(1) The acidizing fracturing fluid disclosed by the invention adopts the synthesized novel iron ion stabilizer, so that not only can the iron ions be reduced into ferrous ions and the difficulty in forming precipitates be improved, but also hydrogen ions can be supplemented into the acidizing fracturing fluid, and the formation of iron ion precipitates is reduced. The reason for this is that: the invention takes thionyl chloride, adhesive and expanded graphite as raw materials to prepare a core, and the surface of the core is coated with a paraffin coating layer to form a core-shell type iron ion stabilizer. Firstly, the iron ion stabilizer can isolate the inner core from the external acid liquid under the protection of the paraffin coating layer, so that the phenomenon that the water in the fracturing fluid enters the inner core in advance to react with thionyl chloride to cause the iron ion stabilizer to be consumed due to the early play of the function is avoided. Under the protection of the paraffin coating, the iron ion stabilizer enters the stratum with the acidizing fracturing fluid to a certain depth, the paraffin coating is gradually melted under the action of high temperature of an oil reservoir, and then the inner core of the iron ion stabilizer is released, at the moment, the acidizing fracturing fluid enters the groundThe hydrogen ions in the acidizing fracturing fluid are consumed due to the reaction of the layer with mineral substances in the stratum in the advancing process, the pH value is increased, favorable conditions for the iron ions to form precipitates are created, and the release and intervention of the inner core of the iron ion stabilizer are beneficial to breaking the favorable conditions in time, so that the difficulty in forming the precipitates is improved. This is due to the thionyl chloride in the core reacting with the water in the fracturing fluid (SOCl) after the paraffin coating has melted 2 + H 2 O→SO 2 + HCl) to generate sulfur dioxide and hydrogen chloride, which are dissolved in water to form sulfurous acid and hydrochloric acid, and can supplement hydrogen ions for the acidizing fracturing fluid at the same time to reduce the pH value of the acidizing fracturing fluid, and the lower the pH value, the more unfavorable the pH value is for iron ions to form precipitates, and the more favorable the formed precipitates are dissolved. In addition, the hydrogen ions are supplemented, so that the acidizing fracturing fluid can further react with the stratum, the acidizing penetration distance is increased, and the oil gas recovery rate is improved. Meanwhile, the sulfurous acid having reducibility can reduce iron ions to ferrous ions (Fe) 3+ + H 2 SO 3 →Fe 2+ + H 2 SO 4 ) Thereby converting the ferric ions which are easy to form precipitates into ferrous ions which are not easy to form precipitates (the precipitates are formed only when the pH value is more than 7). The invention improves the difficulty of forming iron ions into precipitates from multiple aspects by utilizing the novel iron ion stabilizer with special components and functions, and effectively relieves the problem of forming iron ions into precipitates caused by hydrogen ion consumption in the acidified fracturing fluid along with the reaction of the acidified fracturing fluid and the stratum.
(2) The novel iron ion stabilizer also contains a binder and expanded graphite, wherein the expanded graphite is a porous substance with good adsorption performance, so that thionyl chloride can be conveniently contained and stored, and after the inner core is released into fracturing fluid to be decomposed and the binder and the expanded graphite are released into the fracturing fluid, the binder is helpful for increasing the viscosity of the fracturing fluid, so that the reaction degree of hydrogen ions and a stratum is limited, acid liquor can reach a deeper stratum, and the acidification penetration distance is increased. The expanded graphite has good adsorption capacity on metal ions, can absorb the metal ions such as iron ions, ferrous ions, calcium ions, magnesium ions and the like generated by reaction, reduces the formation of metal precipitates, and simultaneously can not cause blockage like the metal precipitates deposited in stratum gaps due to good lubricity, but can carry the adsorbed metal ions to be discharged along with the subsequent flowback process. In addition, the metal ion chelating agent can chelate divalent and trivalent metal ions to form soluble chelate ions, so that only metal ions in the fracturing fluid are reduced, and the formation of metal precipitates is reduced.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers.
In addition, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The reagents or starting materials used in the present invention can be purchased from conventional sources, and unless otherwise specified, the reagents or starting materials used in the present invention can be used in a conventional manner in the art or in accordance with the product specifications.
In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred methods and materials described in this invention are exemplary only. The techniques of the present invention will now be further illustrated with reference to specific embodiments.
Example 1
The preparation method of the acidizing fracturing fluid for oil and gas exploitation comprises the following steps:
(1) Preparation of iron ion stabilizer: liquid thionyl chloride, carboxymethyl cellulose powder and expanded graphite powder with the particle size of 200 to 300 meshes are mixed according to the following weight ratio of 14 parts: 25 parts by weight: 5.5 parts by weight of the components are mixed and then put into a granulator for granulation to form granules with the particle size distribution of 0.5 to 1.0mm for later use.
(2) According to the ratio of the paraffin liquid to the particles of 3:14, placing the particles prepared in the step (2) into a rolling type coating machine, spraying molten paraffin liquid at the temperature of 55 ℃ onto the particles by using a high-speed sprayer to perform rolling coating, so as to form a paraffin coating layer on the surfaces of the particles, cooling in a rolling state after the paraffin coating layer is formed, blowing air for auxiliary cooling, and cooling to room temperature to obtain the core-shell type iron ion stabilizer.
(3) Preparing the following components in parts by weight: 100 parts of water, 0.35 part of a thickening agent (carboxymethyl hydroxypropyl guar gum), 0.6 part of a fracturing cleanup additive (a compound of fatty alcohol polyether, NE-940 of Beckhols), 0.2 part of a metal ion chelating agent (sodium citrate), 0.8 part of the iron ion stabilizer prepared in the embodiment, and 20 parts of an acid solution (a mixture of hydrochloric acid with a mass fraction of 20%, hydrofluoric acid with a mass fraction of 5%, and acetic acid with a mass fraction of 5% in a mass ratio of 3.5.
(4) The fracturing cleanup additive and the metal ion chelating agent are added into water and stirred uniformly, and then the thickening agent is added and stirred uniformly to form thickened fracturing fluid for later use. In use, the thickened fracturing fluid of the embodiment is injected into a production zone of an oil well of a thick oil exploitation test of a certain oil field by high-pressure equipment to make cracks. The acid solution, iron ion stabilizer, is then added to the fracture to erode the fracture to prevent fracture closure after the high pressure is removed. Finally, the oil recovery of the acidified fracturing fluid of the example was calculated to be 32.78%.
Example 2
The preparation method of the acidizing fracturing fluid for oil and gas exploitation comprises the following steps:
(1) Preparation of iron ion stabilizer: liquid thionyl chloride, polyvinyl alcohol 1788 powder and expanded graphite powder with the particle size of 200-300 meshes are mixed according to the weight proportion of 16: 23 parts by weight: mixing 7 parts by weight, and then placing in a granulator for granulation to form particles with the particle size distribution of 1.0-1.5 mm for later use.
(2) According to the ratio of the paraffin liquid to the particles of 2.5:10, placing the particles prepared in the step (2) into a rolling type coating machine, spraying molten paraffin liquid at the temperature of 60 ℃ onto the particles by using a high-speed sprayer to carry out rolling coating, so as to form a paraffin coating layer on the surfaces of the particles, cooling in a rolling state after the completion, simultaneously blowing air for auxiliary cooling, and obtaining the core-shell type iron ion stabilizer after cooling to room temperature.
(3) Preparing the following components in parts by weight: 100 parts of water, 0.2 part of a thickening agent (sodium carboxymethylcellulose), 0.5 part of a fracturing cleanup additive (a fatty alcohol polyether and cationic surfactant complex, NE-201 of the Wedford corporation), 0.15 part of a metal ion chelating agent (sodium citrate), 1.0 part of the iron ion stabilizer prepared in the embodiment, and 15 parts of an acid solution (a mixture of 15 mass percent hydrochloric acid, 3 mass percent hydrofluoric acid and 8 mass percent acetic acid in a mass ratio of 4.
(4) The fracturing cleanup additive and the metal ion chelating agent are added into water and stirred uniformly, and then the thickening agent is added and stirred uniformly to form thickened fracturing fluid for later use. In use, the thickened fracturing fluid of the embodiment is injected into a production zone of an oil well of a thick oil recovery test of a certain oil field by using high-pressure equipment to make cracks in the same manner as in the embodiment 1. The acid solution, iron ion stabilizer, is then added to the fracture to erode the fracture to prevent fracture closure after the high pressure is removed. The final calculation of the acid fracturing fluid oil recovery of this example resulted in 30.26%.
Example 3
The preparation method of the acidizing fracturing fluid for oil and gas exploitation comprises the following steps:
(1) Preparation of iron ion stabilizer: liquid thionyl chloride, pregelatinized corn starch powder and expanded graphite powder with the particle size of 200-300 meshes are mixed according to the weight ratio of 10: 27 parts by weight: mixing 4 parts by weight, and then placing the mixture in a granulator for granulation to form particles with the particle size distribution of 1.0-1.5 mm for later use.
(2) According to the ratio of the paraffin liquid to the particles of 4:15, placing the particles prepared in the step (2) into a rolling type coating machine, spraying molten paraffin liquid at the temperature of 50 ℃ onto the particles by using a high-speed spray head to carry out rolling coating, so as to form a paraffin coating layer on the surfaces of the particles, cooling in a rolling state after the completion, simultaneously blowing air for auxiliary cooling, and obtaining the core-shell type iron ion stabilizer after cooling to room temperature.
(3) Preparing the following components in parts by weight: 100 parts of water, 0.3 part of a thickening agent (Arabic gum), 0.2 part of a fracturing cleanup additive (fluorocarbon surfactant, shanghai catalpi chemical Co., ltd., ZY-823), 0.2 part of a metal ion chelating agent (sodium citrate), 1 part of a corrosion inhibitor (water-soluble imidazoline corrosion inhibitor, jining Mali-Yi chemical Co., ltd.), 0.5 part of the iron ion stabilizer prepared in the embodiment, and 17 parts of an acid solution (a mixture of hydrochloric acid with the mass fraction of 20%, hydrofluoric acid with the mass fraction of 4%, and acetic acid with the mass fraction of 10% in a mass ratio of 5.1.
(4) The fracturing cleanup additive, the metal ion chelating agent and the corrosion inhibitor are added into water and stirred uniformly, and then the thickening agent is added and stirred uniformly to form the thickened fracturing fluid for later use. In use, the thickened fracturing fluid of the embodiment is injected into a production zone of an oil well of a thick oil recovery test of a certain oil field by using high-pressure equipment to make cracks in the same manner as in the embodiment 1. The acid solution, iron ion stabilizer, is then added to the fracture to erode the fracture to prevent fracture closure after the high pressure is removed. Finally, the oil recovery of the acidified fracturing fluid of this example was calculated to be 33.56%.
Example 4
The preparation method of the acidizing fracturing fluid for oil and gas exploitation comprises the following steps:
(1) Preparation of iron ion stabilizer: liquid thionyl chloride, beta-cyclodextrin powder and expanded graphite powder with the particle size of 200 to 300 meshes are mixed according to the weight ratio of 12 parts: 24.5 parts by weight: mixing 5 parts by weight, and then placing the mixture in a granulator for granulation to form granules with the particle size distribution of 0.5-1.0 mm for later use.
(2) According to the ratio of paraffin liquid to particles of 3:13, placing the particles prepared in the step (2) into a rolling type coating machine, spraying molten paraffin liquid at the temperature of 55 ℃ onto the particles by using a high-speed sprayer to carry out rolling coating, so as to form a paraffin coating layer on the surfaces of the particles, cooling in a rolling state after the paraffin coating layer is formed, simultaneously blowing air for auxiliary cooling, and obtaining the core-shell type iron ion stabilizer after the particles are cooled to room temperature.
(3) Preparing the following components in parts by weight: 100 parts of water, 0.45 part of a thickening agent (hydroxymethyl cellulose), 0.8 part of a fracturing cleanup additive (polyether modified trisiloxane, hangzhou silicon new material science and technology Co., ltd., GT-246D), 0.27 part of a metal ion chelating agent (citric acid), 3 parts of a corrosion inhibitor (Mannich base corrosion inhibitor T-160, gallery Jejjie chemical Co., ltd.), 1.1 part of an iron ion stabilizer prepared in the embodiment, and 25 parts of an acid solution (a mixture of 20 mass percent of hydrochloric acid, 4 mass percent of hydrofluoric acid, 10 mass percent of acetic acid according to a mass ratio of 5.
(4) The fracturing cleanup additive, the metal ion chelating agent and the corrosion inhibitor are added into water and stirred uniformly, and then the thickening agent is added and stirred uniformly to form the thickened fracturing fluid for later use. In use, the thickened fracturing fluid of the embodiment is injected into a production zone of an oil well of a thick oil recovery test of a certain oil field by using high-pressure equipment to make cracks in the same manner as in the embodiment 1. The acid solution, iron ion stabilizer, is then added to the fracture to erode the fracture to prevent fracture closure after the high pressure is removed. Finally, the oil recovery of the acidified fracturing fluid of this example was calculated to be 35.17%.
Example 5
The preparation method of the acidizing fracturing fluid for oil and gas exploitation comprises the following steps:
(1) Preparing the following components in parts by weight: 100 parts of water, 0.35 part of a thickening agent (carboxymethyl hydroxypropyl guanidine gum), 0.6 part of a fracturing cleanup additive (a compound of fatty alcohol polyether, NE-940 of Beckhous company), 1.0 part of a metal ion chelating agent (sodium citrate), and 20 parts of an acid solution (a mixture of hydrochloric acid with a mass fraction of 20%, hydrofluoric acid with a mass fraction of 5%, and acetic acid with a mass fraction of 5% according to a mass ratio of 3.5.
(2) The fracturing cleanup additive and the metal ion chelating agent are added into water and stirred uniformly, and then the thickening agent is added and stirred uniformly to form the thickened fracturing fluid for later use. In use, the thickened fracturing fluid of the embodiment is injected into a production zone of an oil well of a thick oil recovery test of a certain oil field by using high-pressure equipment to make cracks in the same manner as in the embodiment 1. The acid is then added to the fracture to erode the fracture to prevent the fracture from closing after the high pressure is removed. Finally, the oil recovery of the acidified fracturing fluid of the example was calculated to be 20.63%.
Example 6
The preparation of the acidizing fracturing fluid for oil and gas exploitation is the same as that in example 2, except that: the step (1) comprises the following steps: liquid thionyl chloride and polyvinyl alcohol 1788 powder are mixed according to the weight ratio of 16 parts: mixing 23 parts by weight of the components, and then placing the mixture in a granulator for granulation to form particles with the particle size distribution of 1.0-1.5 mm. The acidizing fracturing fluid of this example was tested for oil recovery in the same manner as in example 1 and found to be 26.39%.
Example 7
The preparation method of the acidizing fracturing fluid for oil and gas exploitation comprises the following steps:
(1) Preparation of iron ion stabilizer: liquid thionyl chloride, pregelatinized corn starch powder and expanded graphite powder with the particle size of 200-300 meshes are mixed according to the weight proportion of 10: 27 parts by weight: mixing 4 parts by weight, placing the mixture in a granulator for granulation to form particles with the particle size distribution of 1.0-1.5 mm, and taking the particles as an iron ion stabilizer for later use.
(2) Preparing the following components in parts by weight: 100 parts of water, 0.3 part of a thickening agent (Arabic gum), 0.2 part of a fracturing cleanup additive (fluorocarbon surfactant, shanghai catalpi chemical Co., ltd., ZY-823), 0.2 part of a metal ion chelating agent (sodium citrate), 1 part of a corrosion inhibitor (water-soluble imidazoline corrosion inhibitor, jining Mali-Yi chemical Co., ltd.), 0.5 part of the iron ion stabilizer prepared in the embodiment, and 17 parts of an acid solution (a mixture of hydrochloric acid with the mass fraction of 20%, hydrofluoric acid with the mass fraction of 4%, and acetic acid with the mass fraction of 10% in a mass ratio of 5.1.
(3) The fracturing cleanup additive, the metal ion chelating agent and the corrosion inhibitor are added into water and stirred uniformly, and then the thickening agent is added and stirred uniformly to form the thickened fracturing fluid for later use. In use, the thickened fracturing fluid of the embodiment is injected into a production zone of an oil well of a thick oil recovery test of a certain oil field by using high-pressure equipment to make cracks in the same manner as in the embodiment 1. The acid solution, iron ion stabilizer, is then added to the fracture to erode the fracture to prevent fracture closure after the high pressure is removed. The final calculation of the recovery of the acidified fracturing fluid of this example resulted in 24.77%.
Example 8
The preparation of the acidizing fracturing fluid for oil and gas exploitation is the same as that in example 4, except that: the step (1) adopts the following steps: (1) preparation of iron ion stabilizer: and (2) mixing the beta-cyclodextrin powder and expanded graphite powder with the particle size of 200-300 meshes according to the weight ratio of 24.5: mixing 5 parts by weight, and then placing the mixture in a granulator for granulation to form granules with the particle size distribution of 0.5-1.0 mm for later use. The acidizing fracturing fluid of this example was tested for oil recovery in the same manner as in example 1 and found to be 21.57%.
From the test results, it can be seen that the oil recovery rate of the acidized fracturing fluid prepared in example 5~8 is reduced to different degrees compared with that of example 1~4, which shows that the acidized fracturing fluid prepared in example 1~4 by adopting the process of the present invention is more favorable for reducing the formation of iron ion precipitates and improving the permeability of fractures in the formation, so that the acidized fracturing fluid is more favorable for the production of petroleum and the oil recovery rate is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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 (8)
1. The acidizing fracturing fluid for oil and gas exploitation is characterized by comprising the following components in parts by weight: 100 parts of water, 0.2 to 0.45 part of thickening agent, 0.2 to 0.8 part of fracturing drainage assistant, 0.15 to 0.27 part of metal ion chelating agent, 0.5 to 1.1 parts of iron ion stabilizer and 15 to 25 parts of acid liquor;
wherein: the iron ion stabilizer is prepared by the following method: uniformly mixing thionyl chloride liquid, binder powder and expanded graphite, and granulating; then coating the surface of the granulated particles with molten paraffin liquid to form a paraffin coating layer, and cooling the coating layer to obtain the iron ion stabilizer;
the acid solution is prepared from hydrochloric acid, hydrofluoric acid and acetic acid according to a mass ratio of 3.5 to 5:1.6 to 2.1:2.8 to 3.4;
the proportion of the thionyl chloride liquid, the binder powder and the expanded graphite is 10 to 15 parts by weight: 23 to 27 parts by weight: 4~7 parts by weight; wherein: the particle size of the expanded graphite is 200 to 300 meshes;
the ratio of the paraffin liquid to the particles is 2.5 to 4 parts by weight: 10 to 15 parts by weight; the particle size of the particulate matter is between 0.5 and 1.5 mm; the temperature of the paraffin liquid is not higher than 60 ℃.
2. The hydrocarbon recovery acidizing fracturing fluid of claim 1 wherein said viscosifying agent comprises: acacia, hydroxymethyl cellulose, hydroxypropyl cellulose, sodium carboxymethylcellulose, and carboxymethyl hydroxypropyl guar gum.
3. The hydrocarbon recovery acidizing fracturing fluid of claim 1 wherein said fracturing cleanup additive comprises: any one of fluorocarbon surfactants, siloxane surfactants, fatty alcohol polyether compounds and fatty alcohol polyether and cationic surfactant compounds.
4. The oil and gas production acidizing fracturing fluid of claim 1 wherein said acidizing fracturing fluid further comprises 1~3 parts by weight of a corrosion inhibitor, or wherein said corrosion inhibitor comprises: any one of mannich base corrosion inhibitor and imidazoline corrosion inhibitor.
5. The hydrocarbon producing acidizing fracturing fluid of claim 1 wherein said metal ion chelating agent comprises: citric acid or citrate.
6. The acidizing fracturing fluid for oil and gas production according to claim 1, wherein the mass fraction of the hydrochloric acid is 15 to 20%, the mass fraction of the hydrofluoric acid is 3~5%, and the mass fraction of the acetic acid is 5 to 10%.
7. The oil and gas recovery acidizing fracturing fluid of any one of claims 1 to 6 wherein said binder comprises any one of starch, polyvinyl alcohol, carboxymethyl cellulose, cyclodextrin.
8. The method of preparing an acid fracturing fluid for oil and gas recovery of any of claims 1 to 7 comprising the steps of: adding the fracturing cleanup additive, the metal ion chelating agent and/or the corrosion inhibitor into water, uniformly stirring, then adding the thickening agent, and uniformly stirring to form a thickened fracturing fluid; when the viscous fracturing fluid is used, the viscous fracturing fluid is injected into a stratum to manufacture a crack, and then the acid liquid and the iron ion stabilizer are added into the crack to erode the crack.
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2023
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103756663A (en) * | 2013-12-17 | 2014-04-30 | 常州大学 | High performance acidizing fracturing fluid and preparation method thereof |
| CN108865107A (en) * | 2018-08-01 | 2018-11-23 | 四川省威沃敦化工有限公司 | A kind of low frictional resistance deep acidizing acid liquid for acid fracturing of oil/gas well |
| CN108929669A (en) * | 2018-08-17 | 2018-12-04 | 西南石油大学 | Recyclable clean fracturing fluid thickening agent and preparation method thereof, recovery method and high temperature resistant clean fracturing fluid |
| CN111234795A (en) * | 2020-03-02 | 2020-06-05 | 西安奥德石油工程技术有限责任公司 | Wetting reversal agent for ultra-low permeability oil reservoir depressurization and augmented injection and preparation method thereof |
| CN113845892A (en) * | 2021-10-18 | 2021-12-28 | 西南石油大学 | Method for long-acting reservoir protection and reservoir permeability improvement |
| CN114836761A (en) * | 2022-03-21 | 2022-08-02 | 东营众悦石油科技有限公司 | Pickling inhibitor and preparation method thereof |
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