CN110317595B - High calcium magnesium reservoir CO2Foam foaming liquid composition and preparation method and application method thereof - Google Patents
High calcium magnesium reservoir CO2Foam foaming liquid composition and preparation method and application method thereof Download PDFInfo
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- CN110317595B CN110317595B CN201810296296.4A CN201810296296A CN110317595B CN 110317595 B CN110317595 B CN 110317595B CN 201810296296 A CN201810296296 A CN 201810296296A CN 110317595 B CN110317595 B CN 110317595B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/92—Compositions for stimulating production by acting on the underground formation characterised by their form or by the form of their components, e.g. encapsulated material
- C09K8/94—Foams
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Abstract
The invention discloses a high-calcium magnesium oil reservoir CO2Foam foaming liquid composition, preparation method and application method thereof, and CO (carbon monoxide) reservoir with high calcium and magnesium2A foam foaming liquid composition, the composition comprising, by weight: 0.01-0.3 wt% of calcium magnesium ion inhibitor, 0.002-0.1 wt% of foam stabilizer, 0.1-0.6 wt% of foaming agent and the balance of water. The technical scheme of the invention is that a foaming liquid composition comprising a calcium-magnesium ion inhibitor, a foam stabilizer, a foaming agent and the like is mixed with CO2Alternately injecting into the oil deposit to form foam in the oil deposit, and injecting CO subsequently by means of the Jamin effect of the formed foam in the porous medium2The spread range of (A) is enlarged, thereby improving the recovery ratio of crude oil.
Description
Technical Field
The present invention belongs to the field of oil fieldThe technical field of development, in particular to high-calcium magnesium oil reservoir CO2A foam foaming liquid composition, a preparation method and an application method thereof.
Background
The high-calcium-magnesium oil reservoir refers to Ca contained in oil reservoir water2+、Mg2+Oil reservoir with higher divalent ions, specifically Ca2 +、Mg2+And the content of the equivalent divalent ions is more than 400 mg/L. At present, the oil reservoirs mainly adopt water drive development, and the existing chemical drive technology cannot be applied to the oil reservoirs.
CO currently used in conventional reservoirs2The driven foaming agents are more studied: especially in the united states and canada, for example, lignosulfonates described in USP4086964, alpha-olefin sulfonates described in USP4393937, fatty alcohol polyoxyethylene sulfates described in USP4113011, Lathanol LAL70 from Stepan Chemical co, CD1045 from Chevrn, and the like.
Chengechen et al, in CN101089117, disclose a foaming agent consisting of sodium dodecylbenzenesulfonate, modified guanidine gum and water for adjusting the gas suction profile of a carbon dioxide gas well. CN103721625A describes a water-based water-soluble macromolecular surfactant as a foam stabilizer. CN105238380A discloses a novel inorganic fine particle reinforced foam system for oil and gas fields, which comprises 0.2-0.8 wt% of foaming agent, 0.5-2.0 wt% of novel inorganic fine particles and the balance of water; the novel inorganic fine particles are fine particles with the particle size less than or equal to 2.5 mu m which are captured and screened in the atmosphere. CN104140802A discloses a foam scrubbing agent for gas well drainage and gas production, which is prepared by mixing gemini surfactant (quaternary ammonium salt gemini surfactant), zwitterionic surfactant (cocoyl amine propyl betaine or lauroyl amine propyl betaine), high-bond energy surfactant (fluorocarbon surfactant) and high-molecular polymer (polyacrylamide).
CN85102151 describes a carbon dioxide based fluid fracturing fluid for fracturing, wherein the foaming agent is at least one of betaine, sulfated alkoxide, ethoxylated linear alcohol, alkyl quaternary ammonium, alkyl diethanol amine, and alkylamine oxide. CN103980873 disclosesThe foaming agent is one or combination of tetradecyl hydroxysulfobetaine and cocamidopropyl betaine, and the foam stabilizing system is a composite system of polymer and jelly dispersoid. CN105038756 discloses a carbon dioxide foam system added with hydrophilic nanoparticles for oil displacement, which mainly comprises lauryl polyoxyethylene polyoxypropylene ether, hydrophilic silica nanoparticles and sodium chloride. CN1890346 discloses a carbon dioxide foam fluid for acidification, acid fracturing, gravel packing, diversion and cleaning, and its foaming agent is betaine amphoteric surfactant, dodecyl dimethyl benzyl ammonium chloride, etc. CN101619210 discloses a carbon dioxide foam stabilizer suitable for low permeability oil reservoirs, which consists of modified guar gum, hydroxyethyl cellulose and dodecanol. CN103275693 discloses an acidic CO2The efficient foaming agent for the foam fracturing system consists of alkyl dimethyl betaine, alkyl sulfobetaine, hexadecyl hydroxypropyl sulfobetaine and dodecyl alcohol ether glucoside, wherein the carbon chain of the efficient foaming agent is 16-18. CN103881683 discloses a method for using in CO2A foaming agent for blocking gas channeling in oil displacement is composed of a carboxylic acid type imidazoline amphoteric surfactant, alpha-olefin sulfonate, dodecyl dimethyl betaine and alkylolamide. CN104293334X discloses a soluble in CO2The foaming agent consists of alkylphenol polyoxyethylene and ethanol, amyl alcohol and fluoropentyl alcohol as solubilizer. CN104498016A discloses a foaming agent for carbon dioxide flooding and a preparation method thereof, wherein the foaming agent comprises N-dodecyl sodium amino carboxylate and gemini sodium dodecyl carboxylate, and the foam stabilizer is one or a mixture of polyethylene glycol 6000 with molecular weight of 200-. CN102746841B discloses a stable foam system based on nanoparticles and Gemini surfactants.
From the published patents, it is known that although much research has been made on CO at home and abroad2The foaming agent for foam, but the surfactant which is conventionally used for foaming, especially the anionic surfactant, has poor solubility and reduced performance in the formation water of oil reservoirs with high contents of calcium and magnesium ions. The zwitterionic surfactant has good foaming performance and stabilityQualitatively, the solubility in high-calcium magnesium ion water is not affected, but because the molecules of the high-calcium magnesium ion water contain anion and cation ion groups, the high-calcium magnesium ion water is easy to adsorb in a reservoir and lose, so that the high-calcium magnesium ion water is suitable for fracturing of a near-wellbore zone and has certain defects when being used for oil displacement or reservoir deep treatment.
Disclosure of Invention
The invention aims to provide CO suitable for high-calcium magnesium oil reservoir2Foam compositions for forming stable CO in high calcium magnesium brines2Foaming to improve CO2And (4) driving effect.
In order to achieve the above object, the first aspect of the invention provides a high-calcium-magnesium reservoir CO2Foaming foam composition for CO-rich oil reservoirs2A foam foaming liquid composition, the composition comprising, by weight: 0.01-0.3 wt% of calcium magnesium ion inhibitor, 0.002-0.1 wt% of foam stabilizer, 0.1-0.6 wt% of foaming agent and the balance of water.
Preferably, CO is stored in a high calcium magnesium reservoir2A foam foaming liquid composition, the composition comprising, by weight: 0.02-0.1 wt% of calcium-magnesium ion inhibitor, 0.01-0.03 wt% of foam stabilizer, 0.1-0.6 wt% of foaming agent and the balance of water.
Preferably, the calcium magnesium ion inhibitor is an organic phosphonic acid and/or an organic phosphonate; the organic phosphonate is at least one of organic sodium phosphonate, organic potassium phosphonate and organic ammonium phosphonate.
Preferably, the organophosphonic acid comprises: at least one of aminotrimethylene phosphonic acid, ethylenediamine tetramethylene phosphonic acid, hydroxyethylidene diphosphonic acid, diethylenetriamine pentamethylene phosphonic acid, 2-phosphonic butane-1, 2, 4-tricarboxylic acid, 2-hydroxyphosphonoacetic acid, hexamethylenediamine tetramethylidene phosphonic acid, polyaminopolyether methylene phosphonic acid and dihexylenetriamine pentamethylene phosphonic acid;
the organic phosphonate includes: at least one of aminotrimethylene phosphonate, ethylenediamine tetramethylene phosphonate, hydroxyethylidene diphosphonate, diethylenetriamine pentamethylene phosphonate, 2-phosphonic acid butane-1, 2, 4-tricarboxylate, 2-hydroxyphosphonoate, hexamethylenediamine tetramethylidene phosphonate, polyaminopolyether methylene phosphonate and dihexylenediamine pentamethylene phosphonate.
Preferably, the foam stabilizer is alkanolamide nonionic surfactant; preferably cocodiethanolamide.
Preferably, the foaming agent comprises fatty alcohol-polyoxyethylene ether sulfate and/or alpha-olefin sulfonate; the foaming agent preferably comprises fatty alcohol polyoxyethylene ether sulfate and alpha-olefin sulfonate.
Preferably, the alpha-olefin sulfonate is sodium alpha-olefin sulfonate with a carbon number distribution of 12-18, preferably a carbon number distribution of 14-16;
the fatty alcohol-polyoxyethylene ether sulfate comprises at least one of fatty alcohol-polyoxyethylene ether sodium sulfate, fatty alcohol-polyoxyethylene ether ammonium sulfate and fatty alcohol-polyoxyethylene ether potassium sulfate;
the molecular structure of the fatty alcohol-polyoxyethylene ether sulfate is preferably as follows: RO (CH)2CH2O)n-SO3-X, wherein R is C12-C15N is 2-4, X is Na, K or NH4。
Preferably, the water is formation water, tap water, surface water or reservoir reinjection water; the high-calcium-magnesium oil reservoir is an oil reservoir with the divalent ion content higher than 400 mg/L.
The second aspect of the invention provides the high-calcium-magnesium oil reservoir CO2A method of preparing a foam foaming liquid composition, the method comprising: and uniformly mixing water, a calcium-magnesium ion inhibitor, a foam stabilizer and a foaming agent to obtain the foaming liquid composition.
The third aspect of the invention provides the CO oil deposit with high calcium and magnesium2A method of using a foam foaming fluid composition, the method comprising: (1) mixing the foaming liquid composition with CO2Gas is alternately injected into the reservoir and then into the large slug of CO2(ii) a (2) And (4) repeating the step (1).
The technical scheme of the invention is that a foaming liquid composition comprising a calcium-magnesium ion inhibitor, a foam stabilizer, a foaming agent and the like is mixed with CO2Alternately injecting into the reservoir to form foam in the reservoir, and utilizing the formed foam to form pores in the reservoirThe Jamin effect generated in the medium enables the subsequent CO injection2The spread range of (A) is enlarged, thereby improving the recovery ratio of crude oil.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The first aspect of the invention provides CO in a high-calcium-magnesium oil reservoir2Foaming foam composition for CO-rich oil reservoirs2A foam foaming liquid composition, the composition comprising, by weight: 0.01-0.3 wt% of calcium magnesium ion inhibitor, 0.002-0.1 wt% of foam stabilizer, 0.1-0.6 wt% of foaming agent and the balance of water.
Preferably, CO is stored in a high calcium magnesium reservoir2A foam foaming liquid composition, the composition comprising, by weight: 0.02-0.1 wt% of calcium-magnesium ion inhibitor, 0.01-0.03 wt% of foam stabilizer, 0.1-0.6 wt% of foaming agent and the balance of water.
Preferably, the calcium magnesium ion inhibitor is an organic phosphonic acid and/or an organic phosphonate; the organic phosphonate is at least one of organic sodium phosphonate, organic potassium phosphonate and organic ammonium phosphonate.
Preferably, the organophosphonic acid comprises: at least one of aminotrimethylene phosphonic acid, ethylenediamine tetramethylene phosphonic acid, hydroxyethylidene diphosphonic acid, diethylenetriamine pentamethylene phosphonic acid, 2-phosphonic butane-1, 2, 4-tricarboxylic acid, 2-hydroxyphosphonoacetic acid, hexamethylenediamine tetramethylidene phosphonic acid, polyaminopolyether methylene phosphonic acid and dihexylenetriamine pentamethylene phosphonic acid;
the organic phosphonate includes: at least one of aminotrimethylene phosphonate, ethylenediamine tetramethylene phosphonate, hydroxyethylidene diphosphonate, diethylenetriamine pentamethylene phosphonate, 2-phosphonic acid butane-1, 2, 4-tricarboxylate, 2-hydroxyphosphonoate, hexamethylenediamine tetramethylidene phosphonate, polyaminopolyether methylene phosphonate and dihexylenediamine pentamethylene phosphonate.
Preferably, the foam stabilizer is alkanolamide nonionic surfactant; preferably cocodiethanolamide
Preferably, the foaming agent comprises fatty alcohol-polyoxyethylene ether sulfate and/or alpha-olefin sulfonate; the foaming agent preferably comprises fatty alcohol polyoxyethylene ether sulfate and alpha-olefin sulfonate.
Preferably, the alpha-olefin sulfonate is sodium alpha-olefin sulfonate with a carbon number distribution of 12-18, preferably a carbon number distribution of 14-16;
the fatty alcohol-polyoxyethylene ether sulfate comprises at least one of fatty alcohol-polyoxyethylene ether sodium sulfate, fatty alcohol-polyoxyethylene ether ammonium sulfate and fatty alcohol-polyoxyethylene ether potassium sulfate;
the molecular structure of the fatty alcohol-polyoxyethylene ether sulfate is preferably as follows: RO (CH)2CH2O)n-SO3-X, wherein R is C12-C15N is 2-4, X is Na, K or NH4。
Preferably, the water is formation water, tap water, surface water or reservoir reinjection water; the high-calcium-magnesium oil reservoir is an oil reservoir with the divalent ion content higher than 400 mg/L.
Preferably, the water is reservoir reinjection water.
The invention mainly aims at high-calcium-magnesium oil reservoirs, namely Ca in oil reservoir water2+、Mg2+The oil reservoir with high content of divalent ions, specifically Ca in oil reservoir water2+、Mg2+And oil reservoirs with the equivalent divalent ion content higher than 400 mg/L.
The second aspect of the invention provides the high-calcium-magnesium oil reservoir CO2A method of preparing a foam foaming liquid composition, the method comprising: and uniformly mixing water, a calcium-magnesium ion inhibitor, a foam stabilizer and a foaming agent to obtain the foaming liquid composition.
Preferably, water and water are added in sequence,Adding one chemical agent into each of the calcium-magnesium ion inhibitor, the foam stabilizer and the foaming agent, fully stirring, adding the next chemical agent after the added chemical agents are completely dissolved, and finally forming a uniform and transparent aqueous solution until all the components are completely added, namely the high-calcium-magnesium oil reservoir CO2A foam composition.
As a preferred scheme, the high-calcium magnesium oil reservoir CO is prepared2The components of the foam foaming liquid composition are commercially available.
The third aspect of the invention provides the CO oil deposit with high calcium and magnesium2A method of using a foam foaming fluid composition, the method comprising: (1) mixing the foaming liquid composition with CO2Gas is alternately injected into the reservoir and then into the large slug of CO2(ii) a (2) And (4) repeating the step (1).
CO may be formed in an oil reservoir by injecting an aqueous solution of a foamer composition as described herein2Foaming thereby increasing CO2And (4) driving effect.
The invention is further illustrated by the following examples:
example 1
This example provides a high calcium and magnesium reservoir CO2Foaming foam composition for CO-rich oil reservoirs2A foam foaming liquid composition, the composition comprising, by weight: 0.02 wt% of calcium-magnesium ion inhibitor, 0.01 wt% of foam stabilizer, 0.2 wt% of foaming agent and the balance of water; wherein the calcium-magnesium ion inhibitor consists of 2-phosphonic butane-1, 2, 4-tricarboxylic acid and hydroxyl ethylidene diphosphate, and the mass ratio of the two is 1: 1; the foaming agent consists of tetradecanol polyoxyethylene ether sodium sulfate (the polymerization degree n is 2-3) and alpha-olefin sodium sulfonate with the carbon number of 14, wherein the mass ratio of the tetradecanol polyoxyethylene ether sodium sulfate to the alpha-olefin sodium sulfonate is 1: 1; the foam stabilizer is coconut diethanolamide; the water is reservoir reinjection water, the total mineralization of the water is 23000mg/L, and Ca is added2+、Mg2+The content of divalent ions is 560mg/L, and the balance is chloride ions and sodium ions.
The preparation process comprises preparing 1000g of high-calcium magnesium oil reservoir CO2Firstly weighing 997.7g of oil reservoir reinjection water, and putting the oil reservoir reinjection water into a stirring container; 2-Butylphosphonic acid is added in succession0.1g of-1, 2, 4-tricarboxylic acid, 0.1g of hydroxy ethylidene diphosphate, 0.1g of coconut diethanolamide, 1g of sodium fatty alcohol-polyoxyethylene ether sulfate and 1g of alpha-olefin sodium sulfonate, wherein each chemical agent is added and then fully stirred, the next chemical agent is added after the added chemical agents are completely dissolved, and a uniform and transparent aqueous solution is finally formed until all components are added, namely the high-calcium-magnesium oil reservoir CO2A foam composition.
Example 2
This example provides a high calcium and magnesium reservoir CO2Foaming foam composition for CO-rich oil reservoirs2A foam foaming liquid composition, the composition comprising, by weight: 0.05 wt% of calcium-magnesium ion inhibitor, 0.02 wt% of foam stabilizer, 0.2 wt% of foaming agent and the balance of water; wherein the calcium-magnesium ion inhibitor consists of 2-phosphonic butane-1, 2, 4-tricarboxylic acid and amino trimethylene sodium phosphonate, and the mass ratio of the two is 1: 1; the foaming agent consists of tetradecanol polyoxyethylene ether sodium sulfate (the polymerization degree n is 2-3) and alpha-olefin sodium sulfonate with the carbon number of 14, wherein the mass ratio of the tetradecanol polyoxyethylene ether sodium sulfate to the alpha-olefin sodium sulfonate is 3: 1; the foam stabilizer is coconut diethanolamide; the water is reservoir reinjection water, the total mineralization degree of the water is 32000mg/L, and Ca is2+、 Mg2+The content of divalent ions is 2550mg/L, and the balance is chloride ions and sodium ions.
The preparation process comprises preparing 1000g of high-calcium magnesium oil reservoir CO2Firstly weighing 997.3g of oil reservoir reinjection water, and putting the oil reservoir reinjection water into a stirring container; sequentially adding 0.25g of 2-phosphonic butane-1, 2, 4-tricarboxylic acid, 0.25g of aminotrimethylene phosphonic acid sodium, 0.2g of coconut diethanolamide, 1.5g of sodium fatty alcohol polyoxyethylene ether sulfate and 0.5g of alpha-olefin sodium sulfonate, fully stirring after adding one chemical agent, adding the next chemical agent after the added chemical agents are completely dissolved, and finally forming a uniform and transparent water solution of the oil reservoir until all the components are completely added, namely the high-calcium magnesium CO oil reservoir2A foam composition.
Example 3
This example provides a high calcium and magnesium reservoir CO2Foaming foam composition for CO-rich oil reservoirs2Total weight of the foam foaming liquid composition, the groupThe compound comprises: 0.1 wt% of calcium-magnesium ion inhibitor, 0.03 wt% of foam stabilizer, 0.25 wt% of foaming agent and the balance of water; the foaming agent consists of tetradecanol polyoxyethylene ether sodium sulfate (the polymerization degree n is 2-3) and alpha-olefin sodium sulfonate with the carbon number of 14, wherein the mass ratio of the tetradecanol polyoxyethylene ether sodium sulfate to the alpha-olefin sodium sulfonate is 4: 1; the foam stabilizer is coconut diethanolamide; the water is reservoir reinjection water, the total mineralization is 32000mg/L, and Ca is2+、Mg2+The content of divalent ions is 2550mg/L, and the balance is chloride ions and sodium ions.
The preparation process comprises preparing 1000g of high-calcium magnesium oil reservoir CO2Firstly weighing 996.2g of oil reservoir reinjection water, and putting the oil reservoir reinjection water into a stirring container; sequentially adding 1g of 2-phosphonic butane-1, 2, 4-tricarboxylic acid, 0.3g of coconut diethanolamide, 2g of fatty alcohol polyoxyethylene ether ammonium sulfate and 0.5g of alpha-olefin sodium sulfonate, fully stirring after adding each chemical agent, adding the next chemical agent after completely dissolving the added chemical agents, and finally forming a uniform and transparent aqueous solution until all the components are completely added, namely the high-calcium-magnesium oil reservoir CO2A foam composition.
Example 4
This example provides a high calcium and magnesium reservoir CO2Foaming foam composition for CO-rich oil reservoirs2A foam foaming liquid composition, the composition comprising, by weight: 0.012 wt% of calcium-magnesium ion inhibitor, 0.005 wt% of foam stabilizer, 0.2 wt% of foaming agent and the balance of water; wherein the calcium-magnesium ion inhibitor consists of 2-phosphonic butane-1, 2, 4-tricarboxylic acid and hydroxyl ethylidene diphosphate, and the mass ratio of the two is 2: 1; the foaming agent consists of tetradecanol polyoxyethylene ether sodium sulfate (the polymerization degree n is 2-3) and alpha-olefin sodium sulfonate with the carbon number of 14, wherein the mass ratio of the tetradecanol polyoxyethylene ether sodium sulfate to the alpha-olefin sodium sulfonate is 1: 1; the foam stabilizer is coconut diethanolamide; the water is reservoir reinjection water, the total mineralization of the water is 23000mg/L, and Ca is added2+、Mg2+The content of divalent ions is 560mg/L, and the balance is chloride ions and sodium ions.
The preparation process comprises preparing 1000g of high-calcium magnesium oil reservoir CO2Foaming the composition by first weighing the reservoir997.83g of water is injected and put into a stirring container; sequentially adding 0.08g of 2-phosphonic butane-1, 2, 4-tricarboxylic acid, 0.04g of hydroxyl ethylidene diphosphoric acid, 0.05g of coconut diethanolamide, 1g of sodium fatty alcohol polyoxyethylene ether sulfate and 1g of alpha-olefin sodium sulfonate, fully stirring after adding one chemical agent, adding the next chemical agent after the added chemical agents are completely dissolved, and finally forming a uniform and transparent aqueous solution until all components are added, namely the CO of the high-calcium-magnesium oil reservoir2A foam composition.
Example 5
This example provides a high calcium and magnesium reservoir CO2Foaming foam composition for CO-rich oil reservoirs2A foam foaming liquid composition, the composition comprising, by weight: 0.027 wt% of calcium-magnesium ion inhibitor, 0.09 wt% of foam stabilizer, 0.25 wt% of foaming agent and the balance of water; wherein the calcium-magnesium ion inhibitor consists of 2-phosphonic butane-1, 2, 4-tricarboxylic acid and hydroxyl ethylidene diphosphate, and the mass ratio of the two is 2: 1; the foaming agent consists of tetradecanol polyoxyethylene ether sodium sulfate (the polymerization degree n is 2-3) and alpha-olefin sodium sulfonate with the carbon number of 14, wherein the mass ratio of the tetradecanol polyoxyethylene ether sodium sulfate to the alpha-olefin sodium sulfonate is 1: 1; the foam stabilizer is coconut diethanolamide; the water is reservoir reinjection water, the total mineralization of the water is 23000mg/L, and Ca is added2+、Mg2+The content of divalent ions is 560mg/L, and the balance is chloride ions and sodium ions.
The preparation process comprises preparing 1000g of high-calcium magnesium oil reservoir CO2Firstly weighing 996.33g of oil reservoir reinjection water, and putting the oil reservoir reinjection water into a stirring container; sequentially adding 0.18g of 2-phosphonic butane-1, 2, 4-tricarboxylic acid, 0.09g of hydroxy ethylidene diphosphonic acid, 0.9g of coconut diethanolamide, 1.25g of sodium fatty alcohol polyoxyethylene ether sulfate and 1.25g of alpha-olefin sodium sulfonate, fully stirring after adding one chemical agent, adding the next chemical agent after completely dissolving the added chemical agent, and finally forming a uniform and transparent water solution of the oil reservoir until all components are completely added, namely the high-calcium magnesium CO oil reservoir2A foam composition.
Test example
CO for the high-Ca-Mg reservoir prepared in examples 1-32Foaming performance test of foam foaming liquid compositionThe specific test method and the apparatus used are described in patent CN201310141634.4 "a method for determining blowing agent in CO2The device and the method for measuring the medium foaming performance are tested, and the specific test results are shown in table 1.
TABLE 1
| Test temperature | Bubbling volume, mL | Half life, s | |
| Example 1 | 70℃ | 420 | 835 |
| Example 2 | 70℃ | 360 | 640 |
| Example 3 | 70℃ | 370 | 750 |
| Example 4 | 70℃ | 340 | 570 |
| Example 5 | 70℃ | 350 | 520 |
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (3)
1. High-calcium-magnesium oil reservoir CO2Foam-foaming liquid composition, characterized in that CO is deposited in a high-calcium-magnesium reservoir2The total weight of the foam foaming liquid composition is as follows: 0.02-0.1 wt% of calcium-magnesium ion inhibitor, 0.01-0.03 wt% of foam stabilizer, 0.1-0.6 wt% of foaming agent and the balance of water;
the foam stabilizer is coconut diethanolamide;
the foaming agent comprises fatty alcohol-polyoxyethylene ether sulfate and alpha-olefin sulfonate;
the molecular structure of the fatty alcohol-polyoxyethylene ether sulfate is as follows: RO (CH)2CH2O)n-SO3-X, wherein R is C14-C15N is 2-4, X is Na, K or NH4；
The alpha-olefin sulfonate is alpha-olefin sodium sulfonate, and the carbon number distribution is 14-16;
the high-calcium magnesium oil reservoir is an oil reservoir with divalent ion content higher than 400 mg/L;
the water is reservoir reinjection water;
the calcium magnesium ion inhibitor is a mixture of organic phosphonic acid 2-phosphonic acid butane-1, 2, 4-tricarboxylic acid or one of amino trimethylene phosphonic acid and hydroxy ethylidene diphosphonic acid and organic phosphonic acid 2-phosphonic acid butane-1, 2, 4-tricarboxylic acid.
2. The high calcium magnesium reservoir CO of claim 12A method of preparing a foam foaming fluid composition, the method comprising: and uniformly mixing water, a calcium-magnesium ion inhibitor, a foam stabilizer and a foaming agent to obtain the foaming liquid composition.
3. The high calcium magnesium reservoir CO of claim 12A method of using a foam concentrate composition, the method comprising: (1) mixing the foaming liquid composition with CO2Gas is alternately injected into the reservoir and then into the large slug of CO2(ii) a (2) And (4) repeating the step (1).
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| CN117106430B (en) * | 2023-10-18 | 2024-01-23 | 西南石油大学 | Profile control and flooding system suitable for strong heterogeneous oil reservoir and application |
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