CN110607171B - Acidic foam slickwater for continental facies shale fracturing and preparation method thereof - Google Patents
Acidic foam slickwater for continental facies shale fracturing and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an acidic foam slickwater for continental facies shale fracturing and a preparation method thereof. The slippery water comprises the following components in percentage by weight: 0.03-0.2% of resistance reducing agent, 0.1-0.5% of clay stabilizer, 0.1-0.4% of foaming agent, 1-4% of corrosion inhibitor, 5-15% of acid and the balance of water. The resistance reducing agent is a multi-monomer copolymer, and the molecular weight is 1000-1300 ten thousand. The slickwater has good compatibility of all components, does not generate floccules and precipitates, can effectively reduce the friction of fluid in pipelines and shafts, and reduces the friction by more than 70 percent under the indoor experimental condition; the permeability is reduced by less than 15% under the condition of indoor experiment.
Description
Technical Field
The invention belongs to the technical field of fracturing fluid for oil exploitation, and particularly relates to acidic foam slickwater for continental facies shale fracturing and a preparation method thereof.
Background
At present, with the gradual maturity, popularization and application of the marine shale gas fracturing technology, the continental facies shale gas fracturing gradually enters the visual field of people. The resource amount of the continental facies shale gas is extremely huge, but the continental facies shale gas is not suitable for the geological characteristics and the process requirements of the continental facies shale gas because the fracturing technology is not over-closed or is suitable for the fracturing technology of the sea facies shale gas in the early stage.
In the past, continental facies shale gas has been subjected to multi-well fracturing, but due to the particularity of geological characteristics of the continental facies shale gas, severe challenges are brought to fracturing, and the method mainly comprises the following steps:
the high clay content and the high plasticity caused by the high clay content cause difficult initiation and extension of main cracks and difficult formation of diverted branch cracks, so that the complexity and the modification volume of the cracks are difficult to correspondingly promote; high plasticity causes severe proppant embedment, low conductivity and rapid decline. In addition, the hydration expansion phenomenon caused by high clay content is serious, and the flow conductivity of the crack can be seriously influenced; the propagation distance of induced stress caused by high clay is greatly reduced, and therefore, the ability to improve the interference and complexity degree of cracks by using the effect of induced stress is reduced.
In the past, the continental facies shale gas fracturing technology is mostly used for reference or the technology adopting high-viscosity fracturing fluid as a main body, and finally the design idea of a single crack is adopted, even if a long crack with high flow conductivity is formed in the main crack, because of the lower pore permeability brought by high clay high plasticity, the yield after the pressure is reduced rapidly, and the economic development benefit is inevitably lost. Therefore, there is a need to develop a new continental facies shale gas fracturing technology and an acid foamed slickwater fracturing fluid system matched with the technology to solve the above limitations.
CN106566523A (a polymer type acid slick water and a preparation method thereof) is composed of the following raw materials by mass percent: 0.1-7.5% of acid, 0.05-0.2% of acid-resistant resistance-reducing agent, 0.05-0.5% of cleanup additive, 0.05-0.5% of clay stabilizer and the balance of water; the acid is at least one of hydrochloric acid, organic acid and hydrofluoric acid. The method adopts low-concentration hydrochloric acid to dissolve part of carbonate minerals on the surface of the crack, forms a non-uniform etching form on the wall surface of the crack, enhances the flow conductivity of the crack, and can effectively convey a propping agent to the far end of the crack due to certain viscosity of slickwater, further increases the flow conductivity of the crack, and improves the fracturing modification effect on a reservoir stratum. The defects of large water consumption for preparing the liquid, increased environmental protection pressure and invisibly increased damage to a reservoir stratum are overcome.
CN107603586A (low-temperature low-damage shale gas slickwater fracturing fluid and a preparation method thereof) comprises the following components in percentage by mass: 0.01 to 0.08 percent of drag reducer; 0.1 to 0.2 percent of cleanup additive; clay stabilizer 0.2-0.5%; 0.005-0.02% of polymer breaker; the balance being water. The slickwater fracturing fluid has good salt resistance, and the flowback fluid is clear and transparent, has no residue, does not need flocculation and precipitation treatment, can be directly or repeatedly utilized after being diluted by clear water, and reduces the burden of environmental protection. However, the fracturing fluid is suitable for low-temperature normal-pressure shale oil and gas reservoirs, is a conventional slickwater system, and is not mentioned for the continental facies shale oil and gas reservoirs.
Disclosure of Invention
The invention provides an acidic foamed slickwater for continental shale fracturing and a preparation method thereof.
The invention aims to provide an acid foam slickwater for continental shale fracturing, which is prepared by mixing the following raw materials in percentage by weight and introducing saturated carbon dioxide into the raw materials:
the friction reducer is used for reducing friction resistance of the fracturing fluid and is a copolymer formed by copolymerizing acrylamide, acryloyloxyethyl trimethyl ammonium chloride, 2-acrylamido-2-methylpropanesulfonic acid and a hydrophobic monomer, and the molecular weight of the copolymer is preferably 1000-1300 ten thousand.
The introduction of the hydrophobic monomer can increase the viscoelasticity of the resistance reducing agent in an acid solution, and the hydrophobic monomer is tetradecyl dimethyl allyl ammonium chloride, hexadecyl dimethyl allyl ammonium chloride or octadecyl dimethyl allyl ammonium chloride and the like.
The resistance reducing agent comprises, by weight, 20-40% of total monomers in the reaction solution, and 100 parts of the total weight of four monomers, wherein the total weight of the four monomers comprises 40-60 parts of acrylamide, 4-8 parts of acryloyloxyethyl trimethyl ammonium chloride, 30-50 parts of 2-acrylamido-2-methylpropanesulfonic acid, and 1-2 parts of hydrophobic monomers.
The preparation method of the resistance reducing agent can adopt a conventional polymerization method in the prior art, and the method can be preferably carried out according to the following steps:
sequentially adding four monomers of acrylamide, acryloyloxyethyl trimethyl ammonium chloride, 2-acrylamido-2-methylpropanesulfonic acid and hydrophobic monomer into deionized water to be used as total monomers until the monomers are dissolved; adding 30% sodium hydroxide aqueous solution into the solution to adjust the pH value to 7.0 to obtain reaction solution; introducing nitrogen to remove oxygen in the reaction liquid; then adding 0.03-0.05% of an initiation system (ammonium persulfate aqueous solution and sodium bisulfite aqueous solution 1:1), and immediately removing oxygen in the reaction solution; and (3) carrying out a closed reaction at 20-38 ℃ for 4-6 hours to obtain a colloidal polymer, cutting the colloidal polymer, drying at 50-80 ℃ to constant weight, crushing, and sieving with a standard sieve of 40-80 meshes to obtain the resistance reducing agent.
The acid is used for eliminating damage caused by clay or other siliceous mineral blockage and increasing the flow capacity of a damage area, and the acid is at least one of hydrochloric acid, hydrofluoric acid and low molecular carboxylic acid, and the low molecular carboxylic acid can be at least one of formic acid, acetic acid and propionic acid.
The clay stabilizer is used for preventing clay swelling in shale, and a clay stabilizer conventional in the art can be used, and in the invention, at least one of potassium chloride, choline chloride, poly isopropanoldimethyl ammonium chloride and hexadecyltrimethyl ammonium chloride can be preferably used, and the potassium chloride and the choline chloride are more preferably used in a mass ratio of 1: 1.
The foaming agent is used for generating uniform and stable foams so as to form CO2 foam slickwater, reducing the using amount of water, reducing damage and accelerating the later stage fracturing fluid flowback, and a conventional foaming agent in the field can be adopted.
The corrosion inhibitor has the function of preventing acid liquor from corroding devices such as mineshafts, pipelines and the like in the fracturing construction process, the corrosion inhibitor can be conventional in the field, at least one of urotropine, an imidazoline surfactant and polyoxyethylene octyl phenol ether-10 (op10) can be preferably selected in the corrosion inhibitor, the imidazoline surfactant and op10 are preferably selected, and the ratio of the urotropine, the imidazoline surfactant and the op10 is 4: 1. The imidazoline surfactant is preferably imidazoline quaternary ammonium salt, imidazoline sulfate, imidazoline oleate, etc.
The invention can also add various common additives in the field such as bactericides, iron ion stabilizers, gel breakers and the like according to the processing requirements, and the dosage of the additives is conventional dosage or is adjusted according to the requirements of actual conditions.
The invention also aims to provide a preparation method of the acid foam slickwater for continental shale fracturing, which comprises the following steps:
1) preparing an acid solution under the stirring condition;
2) adding the resistance reducing agent into the acid solution under the stirring condition;
3) adding a clay stabilizer and a corrosion inhibitor into the solution obtained in the step 2) under the condition of stirring until the mixture is completely and uniformly mixed, adding a foaming agent, uniformly mixing, and introducing saturated carbon dioxide to obtain the acidic foam slickwater.
Preferably, the preparation method comprises the following steps:
1) adding acid into clear water under the condition of continuous stirring at 600-1000rpm to ensure that the acid content is 5-15%.
2) Slowly adding the resistance reducing agent into the acid solution under the stirring condition of 1000-1500 rpm, and continuously stirring for 10min under the stirring condition of 600-1000rpm to completely dissolve the resistance reducing agent.
3) And under the condition of 600-1000 continuous stirring, sequentially adding a clay stabilizer and a corrosion inhibitor until the clay stabilizer and the corrosion inhibitor are completely and uniformly mixed, adding a foaming agent, and uniformly mixing.
4) Measuring a certain volume of the base liquid obtained in the step 3), pouring the base liquid into a Wuyi mixing and adjusting device, covering and sealing the Wuyi mixing and adjusting device, slowly ventilating the solution by using a CO2 gas source, adjusting the rotating speed of the mixing and adjusting device to 600-800 rpm, stopping stirring for 5 minutes, immediately pouring the mixture into a 1000mL measuring cylinder, and reading the volume of foams.
The acidic foam slickwater disclosed by the invention is good in compatibility of all components, and free of floccules and precipitates, so that the friction resistance of fluid in pipelines and shafts can be effectively reduced, the use amount of clear water can be greatly reduced, the environmental burden is reduced, and the friction resistance is reduced by more than 70% under indoor experimental conditions; the slickwater disclosed by the invention is small in damage to a reservoir stratum, and the permeability is reduced by less than 15% under an indoor experimental condition.
The acid foam slickwater fracturing fluid designed by the invention is suitable for the acid slickwater fracturing fluid for the laminated fracture of the continental shale reservoir, not only can obviously reduce the friction resistance, but also has good compatibility with other components in the slickwater and has little damage to the reservoir. With the expansion of development scale of continental facies shale oil and shale gas, the invention has wide application prospect.
Detailed Description
All the raw materials used in this example were commercially available except that the resistance reducing agent was self-made.
Example 1
This example is a preparation of an acidic foamed slickwater fracturing fluid consisting of: 0.1% of resistance reducing agent, 0.3% of clay stabilizer, 0.2% of foaming agent, 1% of corrosion inhibitor, 5% of HCl, 93.4% of clear water, CO2A gas.
The clay stabilizer is KCl and choline chloride, and the mass ratio of the KCl to the choline chloride is 1: 1; the foaming agent is perfluoro lauryl polyoxyethylene ether and betaine, and the mass ratio of the perfluoro lauryl polyoxyethylene ether to the betaine is 1: 5; the corrosion inhibitor is imidazoline quaternary ammonium salt and op10, and the ratio of the imidazoline quaternary ammonium salt to the op10 is 4: 1.
Preparing a resistance reducing agent:
sequentially adding four monomers of acrylamide, acryloyloxyethyl trimethyl ammonium chloride, 2-acrylamido-2-methylpropanesulfonic acid and hexadecyl dimethyl allyl ammonium chloride into deionized water to be used as total monomers until the monomers are dissolved; the reaction solution comprises, by mass, 30% of total monomers, 45 parts of acrylamide, 8 parts of acryloyloxyethyl trimethyl ammonium chloride, 45 parts of 2-acrylamido-2-methylpropanesulfonic acid and 2 parts of hexadecyl dimethyl allyl ammonium chloride; adding 30% sodium hydroxide aqueous solution into the solution to adjust the pH value to 7.0 to obtain reaction solution; introducing nitrogen to remove oxygen in the reaction liquid; then adding 0.05% of an initiation system (ammonium persulfate aqueous solution and sodium bisulfite aqueous solution 1:1), and immediately removing oxygen in the reaction solution; and (3) carrying out closed reaction for 5 hours at the temperature of 30 ℃ to obtain a colloidal polymer, cutting the colloidal polymer, drying at the temperature of 70 ℃ to constant weight, crushing, and sieving by a standard sieve of 60 meshes to obtain the resistance reducing agent with the molecular weight of 1000 ten thousand.
Taking the preparation of 1L of slickwater fracturing fluid as an example, the preparation method comprises the following steps:
1) 135.1g of 37% hydrochloric acid was added to 848.9g of clear water with continuous stirring at 600rpm until complete dissolution.
2) 1g of friction reducer is slowly added into the solution in the step 1) under the stirring condition of 1000rpm, and stirring is continuously carried out at 600rpm for 10min, so that the friction reducer is completely dissolved.
3) Under the condition of continuous stirring at 600rpm, 3g of clay stabilizer and 10g of corrosion inhibitor are sequentially added until the mixture is completely and uniformly mixed, and 2g of foaming agent is added and uniformly mixed.
4) Pouring the solution prepared in the step 3) into a Wuyi mixing and adjusting device, covering and sealing the Wuyi mixing and adjusting device, and using CO2The air source slowly aerates the solution, the rotation speed of the mixer is adjusted to 600rpm, the stirring is stopped for 5 minutes, the mixture is immediately poured into a 5000mL measuring cylinder, and the volume of the foam is read.
The resistance reduction rate is measured by an acid corrosion pipeline friction resistance instrument, and the shear rate is 12000S-1When the resistance is high, the resistance reduction rate is 73.2 percent; the damage rate of the continental facies shale reservoir stratum determined by an acidification displacement experimental device is 9.7 percent.
Example 2
This example is a preparation of an acidic foamed slickwater fracturing fluid consisting of: 0.2% of resistance reducing agent, 0.3% of clay stabilizer, 0.3% of foaming agent, 3% of corrosion inhibitor, 10% of HCl, 86.2% of clear water, CO2A gas.
The clay stabilizer, foaming agent and corrosion inhibitor were all the raw materials used in example 1.
Preparing a resistance reducing agent:
sequentially adding four monomers of acrylamide, acryloyloxyethyl trimethyl ammonium chloride, 2-acrylamido-2-methylpropanesulfonic acid and hexadecyl dimethyl allyl ammonium chloride into deionized water to be used as total monomers until the monomers are dissolved; the reaction solution comprises, by mass, 40% of total monomers, 60% of acrylamide, 4% of acryloyloxyethyl trimethyl ammonium chloride, 35% of 2-acrylamido-2-methylpropanesulfonic acid and 1% of hexadecyl dimethyl allyl ammonium chloride; adding 30% sodium hydroxide aqueous solution into the solution to adjust the pH value to 7.0 to obtain reaction solution; introducing nitrogen to remove oxygen in the reaction liquid; then adding 0.04% of an initiating system (ammonium persulfate aqueous solution and sodium bisulfite aqueous solution 1:1), and immediately removing oxygen in the reaction solution; and (3) carrying out closed reaction for 6 hours at 30 ℃ to obtain a colloidal polymer, cutting the colloidal polymer, drying at 70 ℃ to constant weight, crushing, and sieving by a 60-mesh standard sieve to obtain the resistance reducing agent with the molecular weight of 1200 ten thousand.
Taking the preparation of 1L of slickwater fracturing fluid as an example, the preparation method comprises the following steps:
1) while stirring was continued at 600rpm, 270.2g of 37% hydrochloric acid was added to 691.8g of clear water until complete dissolution.
2) 2g of friction reducer is slowly added into the solution in the step 1) under the stirring condition of 1000rpm, and stirring is continuously carried out for 10min at 600rpm, so that the friction reducer is completely dissolved.
3) Under the condition of continuous stirring at 600rpm, 3g of clay stabilizer and 30g of corrosion inhibitor are sequentially added until the mixture is completely and uniformly mixed, and 3g of foaming agent is added and uniformly mixed.
4) Pouring the solution prepared in the step 3) into a Wuyi mixing and adjusting device, covering and sealing the Wuyi mixing and adjusting device, and using CO2The air source slowly aerates the solution, the rotation speed of the mixer is adjusted to 700rpm, the stirring is stopped for 5 minutes, the mixture is immediately poured into a 5000mL measuring cylinder, and the volume of the foam is read.
The resistance reduction rate is measured by an acid corrosion pipeline friction resistance instrument, and the shear rate is 12000S-1When the resistance is higher than the threshold value, the resistance reduction rate is 70.1 percent; the damage rate of the continental facies shale reservoir stratum determined by an acidification displacement experimental device is 14.8 percent.
Example 3
This example is a preparation of an acidic foamed slickwater fracturing fluid consisting of: 0.15 percent of resistance reducing agentClay stabilizer 0.2%, foaming agent 0.3%, corrosion inhibitor 2%, HCl 7.5%, clear water 89.85%, CO2A gas.
The clay stabilizer, foaming agent and corrosion inhibitor were all the raw materials used in example 1, and the copolymer prepared in example 1 was used as the resistance-reducing agent.
Taking the preparation of 1L of slickwater fracturing fluid as an example, the preparation method comprises the following steps:
1) 202.7g of 37% hydrochloric acid was added to 770.8g of clear water with continuous stirring at 600rpm until complete dissolution.
2) 1.5g of friction reducer is slowly added into the solution in the step 1) under the stirring condition of 1000rpm, and stirring is continuously carried out for 10min at 600rpm, so that the friction reducer is completely dissolved.
3) Under the condition of continuous stirring at 600rpm, 2g of clay stabilizer and 20g of corrosion inhibitor are sequentially added until the mixture is completely and uniformly mixed, and 3g of foaming agent is added and uniformly mixed.
4) Pouring the solution prepared in the step 3) into a Wuyi mixing and adjusting device, covering and sealing the Wuyi mixing and adjusting device, and using CO2The air source slowly aerates the solution, the rotation speed of the mixer is adjusted to 800rpm, the stirring is stopped for 5 minutes, the mixture is immediately poured into a 5000mL measuring cylinder, and the volume of the foam is read.
The resistance reduction rate is measured by an acid corrosion pipeline friction resistance instrument, and the shear rate is 12000S-1When the resistance is larger than the threshold value, the resistance reducing rate is 71.0 percent; the damage rate of the continental facies shale reservoir stratum determined by an acidification displacement experimental device is 12.3 percent.
Example 4
This example is a preparation of an acidic foamed slickwater fracturing fluid consisting of: 0.15% of resistance reducing agent, 0.1% of clay stabilizer, 0.2% of foaming agent, 1.5% of corrosion inhibitor, 5% of HCl, 93.05% of clear water, CO2A gas.
The clay stabilizer, foaming agent and corrosion inhibitor were all the raw materials used in example 1, and the copolymer prepared in example 1 was used as the resistance-reducing agent.
Taking the preparation of 1L of slickwater fracturing fluid as an example, the preparation method comprises the following steps:
1) 135.1g of 37% hydrochloric acid was added to 845.4g of clear water with continuous stirring at 600rpm until complete dissolution.
2) 1.5g of friction reducer is slowly added into the solution in the step 1) under the stirring condition of 1000rpm, and stirring is continuously carried out for 10min at 600rpm, so that the friction reducer is completely dissolved.
3) Under the condition of continuous stirring at 600rpm, 1g of clay stabilizer and 15g of corrosion inhibitor are sequentially added until the mixture is completely and uniformly mixed, and 2g of foaming agent is added and uniformly mixed.
4) Pouring the solution prepared in the step 3) into a Wuyi mixing and adjusting device, covering and sealing the Wuyi mixing and adjusting device, and using CO2The air source slowly aerates the solution, the rotation speed of the mixer is adjusted to 600rpm, the stirring is stopped for 5 minutes, the mixture is immediately poured into a 5000mL measuring cylinder, and the volume of the foam is read.
The resistance reduction rate is measured by an acid corrosion pipeline friction resistance instrument, and the shear rate is 12000S-1When the resistance is high, the resistance reduction rate is 73.8 percent; the damage rate of the continental facies shale reservoir stratum determined by an acidification displacement experimental device is 11.0 percent.
Claims (10)
1. The acidic foamed slickwater for the continental facies shale fracturing is characterized by being prepared by mixing the following raw materials in percentage by weight and introducing saturated carbon dioxide into the raw materials:
0.03-0.2% of resistance reducing agent;
0.1-0.5% of clay stabilizer;
0.1-0.4% of foaming agent;
1-4% of a corrosion inhibitor;
5-15% of acid;
the balance of water;
the resistance reducing agent is a copolymer formed by copolymerizing acrylamide, acryloyloxyethyl trimethyl ammonium chloride, 2-acrylamido-2-methylpropanesulfonic acid and a hydrophobic monomer, wherein the hydrophobic monomer is tetradecyl dimethyl allyl ammonium chloride, hexadecyl dimethyl allyl ammonium chloride or octadecyl dimethyl allyl ammonium chloride; the total weight of the four monomers is 100 parts by weight, wherein the total weight of the four monomers comprises 40-60 parts of acrylamide, 4-8 parts of acryloyloxyethyl trimethyl ammonium chloride, 30-50 parts of 2-acrylamido-2-methylpropanesulfonic acid and 1-2 parts of hydrophobic monomer;
the acid is at least one of hydrochloric acid, hydrofluoric acid and low molecular carboxylic acid.
2. The acidic foamed slickwater according to claim 1, characterized in that the slickwater is prepared by mixing the following raw materials and introducing saturated carbon dioxide, and the weight percentage of the raw materials is as follows:
0.1 to 0.2 percent of resistance reducing agent;
0.1-0.3% of clay stabilizer;
0.2-0.3% of foaming agent;
1-3% of a corrosion inhibitor;
5-10% of acid;
the balance being water.
3. The acidic foam slickwater according to claim 1, characterized in that:
the molecular weight of the resistance reducing agent is 1000-1300 ten thousand.
4. The acidic foam slickwater according to claim 1, characterized in that:
the resistance reducing agent comprises, by weight, 20-40% of the total monomers in the reaction solution.
5. The acidic foam slickwater according to claim 1, characterized in that:
the clay stabilizer is at least one of potassium chloride, choline chloride, poly isopropanoldimethyl ammonium chloride and hexadecyltrimethyl ammonium chloride.
6. The acidic foam slickwater according to claim 1, characterized in that:
the foaming agent is at least one of perfluorolauryl polyoxyethylene ether and betaine.
7. The acidic foam slickwater according to claim 1, characterized in that:
the corrosion inhibitor is at least one of urotropine, imidazoline surfactant and polyoxyethylene octyl phenol ether-10.
8. The acidic foam slickwater according to claim 1, characterized in that:
the low molecular carboxylic acid is at least one of formic acid, acetic acid and propionic acid.
9. A method for preparing acidic foamed slickwater for continental shale fracturing according to any one of claims 1 to 8, characterized by comprising the following steps:
1) preparing an acid solution under the stirring condition;
2) adding the resistance reducing agent into the acid solution under the stirring condition;
3) adding a clay stabilizer and a corrosion inhibitor into the solution obtained in the step 2) under the condition of stirring until the mixture is completely and uniformly mixed, adding a foaming agent, uniformly mixing, and introducing saturated carbon dioxide to obtain the acidic foam slickwater.
10. A process for the preparation of an acidic foamed slickwater according to claim 9, characterised in that:
in the step 1), the stirring speed is 600-1000 rpm;
in the step 2), the stirring speed is 600-1500 rpm;
in the step 3), the stirring speed is 600-1000 rpm.
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| CN110746536B (en) * | 2019-11-06 | 2021-06-08 | 中国石油集团渤海钻探工程有限公司 | Resistance reducing agent for slickwater and preparation method thereof |
| CN111748054B (en) * | 2020-05-25 | 2022-06-03 | 中国石油天然气股份有限公司 | Acid-resistant resistance-reducing agent, preparation method thereof and acid-resistant slickwater fracturing fluid system |
| CN114482963B (en) * | 2020-10-27 | 2024-08-06 | 中国石油化工股份有限公司 | Reservoir transformation method for hydraulic fracturing and application |
| CN114607334A (en) * | 2020-12-08 | 2022-06-10 | 中国石油化工股份有限公司 | Continental facies shale gas reservoir fracturing method |
| CN113684016A (en) * | 2021-08-27 | 2021-11-23 | 西安长庆化工集团有限公司 | Super-salt-tolerant suspended slickwater resistance reducing agent and preparation method thereof |
| CN116410730A (en) * | 2021-12-31 | 2023-07-11 | 中国石油天然气股份有限公司 | Mixed gas foam fracturing fluid and preparation method thereof |
| CN116925721A (en) * | 2022-03-30 | 2023-10-24 | 中国石油天然气股份有限公司 | Clastic rock reservoir reconstruction liquid |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0566394A1 (en) * | 1992-04-17 | 1993-10-20 | Halliburton Company | Gas well treatment compositions and methods |
| CN104531129A (en) * | 2015-01-09 | 2015-04-22 | 成都佰椿石油科技有限公司 | Clean carbon dioxide foam fracturing fluid and preparation method thereof |
| WO2015068688A1 (en) * | 2013-11-05 | 2015-05-14 | 株式会社カネカ | Method of manufacturing hydrocarbon fluid from hydrocarbon fluid-rich shale |
| CN107057675A (en) * | 2017-05-19 | 2017-08-18 | 中国石油集团川庆钻探工程有限公司 | High-salt-tolerance reversed-phase emulsion resistance reducing agent suitable for shale reservoir fracturing modification |
| CN107501470A (en) * | 2017-08-28 | 2017-12-22 | 如皋市玉辉助剂厂 | A kind of acid liquid drag reducer and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102604625B (en) * | 2012-03-02 | 2014-06-11 | 陕西延长石油(集团)有限责任公司研究院 | Water-based fracturing fluid used for continental face shale gas fracturing and preparation method thereof |
| CN103924955B (en) * | 2014-04-21 | 2017-10-13 | 陕西延长石油(集团)有限责任公司研究院 | A kind of shale gas well CO2And slippery water mixing fracturing technology |
| CN105349131A (en) * | 2015-09-29 | 2016-02-24 | 成都理工大学 | Shale gas reservoir deep transformation method based on acidic slickwater |
| CN106496409B (en) * | 2016-10-25 | 2018-07-06 | 长江大学 | A kind of multi-functional smooth concentrated liquid for having both drag reducer, cleanup additive and clay stabilizer property |
-
2018
- 2018-06-15 CN CN201810619362.7A patent/CN110607171B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0566394A1 (en) * | 1992-04-17 | 1993-10-20 | Halliburton Company | Gas well treatment compositions and methods |
| WO2015068688A1 (en) * | 2013-11-05 | 2015-05-14 | 株式会社カネカ | Method of manufacturing hydrocarbon fluid from hydrocarbon fluid-rich shale |
| CN104531129A (en) * | 2015-01-09 | 2015-04-22 | 成都佰椿石油科技有限公司 | Clean carbon dioxide foam fracturing fluid and preparation method thereof |
| CN107057675A (en) * | 2017-05-19 | 2017-08-18 | 中国石油集团川庆钻探工程有限公司 | High-salt-tolerance reversed-phase emulsion resistance reducing agent suitable for shale reservoir fracturing modification |
| CN107501470A (en) * | 2017-08-28 | 2017-12-22 | 如皋市玉辉助剂厂 | A kind of acid liquid drag reducer and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 四元两性疏水聚合物溶液流变和减阻性能;彭飞等;《钻井液与完井液》;20160131;第33卷(第1期);第92-96页 * |
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