CN111139051B - Heavy oil reservoir CO2Foam channeling sealing agent for flooding and preparation method and application thereof - Google Patents
Heavy oil reservoir CO2Foam channeling sealing agent for flooding and preparation method and application thereof Download PDFInfo
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- CN111139051B CN111139051B CN202010262672.5A CN202010262672A CN111139051B CN 111139051 B CN111139051 B CN 111139051B CN 202010262672 A CN202010262672 A CN 202010262672A CN 111139051 B CN111139051 B CN 111139051B
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- 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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- 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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Abstract
The invention provides a heavy oil reservoir CO2A foam channeling sealing agent for flooding, a preparation method and application thereof, belonging to heavy oil reservoir CO2The technical field of flooding, and can solve the technical problems of complex process, poor foaming capability, low stability and the like of the existing foam channeling sealing agent. CO of the heavy oil reservoir2The mass concentration of alpha-alkenyl sulfonate in the foam sealing channeling agent for flooding is 40-60%, the mass concentration of quaternary ammonium salt type imidazoline is 10-20%, the mass concentration of hydroxyethyl cellulose is 3-5%, and Na is added5P3O10The mass concentration of the water-soluble organic compound is 10-15%, and the balance is water. The invention can effectively control the gas channeling and the fluidity, thereby improving the CO2The swept volume of the flooding is utilized to achieve the purposes of profile control and equal fluidity control, and further the aim of improving the recovery ratio is achieved.
Description
Technical Field
The invention belongs to heavy oil reservoir CO2The technical field of flooding, in particular to heavy oil reservoir CO2A foam channeling sealing agent for flooding and a preparation method and application thereof.
Background
Heavy oil reservoir CO2Flooding is a mature method for increasing the recovery ratio and reducing the sourceOil viscosity, oil displacement efficiency improvement, stratum permeability improvement, clay particle expansion inhibition, wide application range, lower cost and the like. Foreign CO2Oil recovery technology is most widely used in the United states, Canada, the former Soviet Union, the United kingdom, etc., and in recent years CO has been used2Oil recovery is second only to thermal recovery technology in the United states, and can improve the recovery ratio by 15% -25%. The domestic Daqing oil field, Shengli oil field, Central China oil field, Liaohe oil field, Jiangsu oil field and the like are subjected to CO2The oil displacement experiment obtains certain effect.
In CO2In the oil displacement process, due to the heterogeneity of stratum and CO2The fluidity is much higher than that of crude oil, which will lead to gas channeling and viscous fingering. Thereby controlling gas channeling and fluidity and further increasing CO2The swept volume of the flooding to achieve the purposes of profile control and equal fluidity control, namely CO in the future2The key to the research and application of enhanced oil recovery. Especially for CO difficult to achieve2Miscible-phase flooding oil deposit and internal subareas of the oil deposit, plugging, profile control and mobility control are very important for improving the recovery ratio.
Patent application CN106318362A discloses a carbon dioxide foaming agent for oil displacement and a preparation method thereof, wherein the main agent of the foaming agent is coconut oleic acid diethanolamine, which has poor foaming capability and low stability and is difficult to form continuous and effective foam increasing and stabilizing effects. Patent application CN105038756A discloses a carbon dioxide foam system added with hydrophilic nanoparticles for oil displacement and a preparation method thereof, wherein the production process of the main agent of the foaming agent, namely lauryl alcohol polyoxyethylene polyoxypropylene ether and hydrophilic silica nanoparticles, is complex, and the cost is high. Hitherto, CO with simpler process, lower energy consumption, better foam effect and corrosion inhibition performance2The foam channeling sealing agent for displacement is not published or disclosed.
Disclosure of Invention
The invention provides a heavy oil reservoir CO2A foam channeling sealing agent for flooding, a preparation method and application thereof, and CO2The flooding foam channeling sealing agent has the advantages of simple process, long half-life period, good foam effect, corrosion inhibition performance and capability of effectively controlling CO2Gas channeling and fluidity, and improved oil displacement efficiency.
To achieveIn order to achieve the purpose, the invention provides CO for a heavy oil reservoir2The foam channeling sealing agent for the flooding comprises 40-60% of alpha-alkenyl sulfonate, 10-20% of quaternary ammonium salt type imidazoline, 3-5% of hydroxyethyl cellulose and Na5P3O10The mass concentration of the water-soluble organic compound is 10-15%, and the balance is water. The system has excellent foaming performance and corrosion inhibition capability.
Preferably, the alpha-olefin sulfonate has the formula:
wherein R is1Is alkyl with 9-13 carbons, n is any integer of 1-3, M is selected from Na+Or K+. It is understood that under the same conditions, the solubility of the alpha-olefin sulfonate decreases as the carbon chain increases. But has better solubility in a wider carbon number range (C12-C18). Among them, the carbon number is 14, 16 for the solubility and foaming properties are good.
Preferably, the quaternary ammonium salt type imidazoline has a molecular formula of:
wherein R is2Is composed of
Or
Wherein the carboxyl and sulfo groups are added to make the imidazoline molecule have excellent biodegradation performance and foam stability, but the imidazoline molecule can not be limited to the carboxyl and sulfo groups. n is an integer of 1 to 4, for example, 2 or 3, R3The alkyl group having less than 4 carbon atoms may be, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, or the like.
Preferably, the hydroxyethyl cellulose has the molecular formula:
wherein R is H or
X =1 or 2, n is any integer having a molecular weight of 150-7500
And (4) counting. In the technical scheme, the selection of R is beneficial to realizing instant dissolution and playing a foam stabilizing role in a short time. The preferred viscosity of the hydroxyethylcellulose is from 800 mPas to 1300 mPas.
The invention provides a preparation method of a foam channeling sealing agent for CO2 flooding of a heavy oil reservoir according to any one of the technical schemes, and the preparation method has the advantages of easily obtained raw materials, simple operation, low cost and easy realization of industrialization. The method comprises the following steps:
adding a certain amount of water into a reaction kettle, adding Na into the reaction kettle under stirring at the reaction temperature of 40-60 DEG C5P3O10Up to Na5P3O10Dissolving;
then slowly adding hydroxyethyl cellulose into the reaction kettle, and continuously stirring until the hydroxyethyl cellulose is dissolved;
then sequentially adding alpha-alkenyl sulfonate and quaternary ammonium type imidazoline into the reaction kettle, and stirring and uniformly mixing to obtain the heavy oil reservoir CO2The foam channeling sealing agent is used for driving.
Preferably, water and Na are used in the reaction5P3O10The mass ratio of the hydroxyethyl cellulose to the hydroxyethyl cellulose is (4.0-5.7): (3.0-3.4): 1.0. For example, the mass ratio may be 4.0:3.0:1, 4.0:3.4:1, 5.7:3.0:1, 5.7:3.4:1, and the like.
Preferably, the mass ratio of the alpha-olefin sulfonate, the quaternary ammonium imidazoline and the water in the reaction is (2.0-6.0):1.0: (1.0-1.7). For example, the mass ratio may be 2.0:1.0:1.0, 2.0:1.0: 1.7, 6.0: 1.0:1.0, 6.0: 1.0: 1.7, etc.
The invention provides a method according to any one of the above techniquesThe heavy oil reservoir CO of the technical scheme2Foam channeling sealing agent for flooding in heavy oil reservoir CO2Application in driving.
Preferably, the foam channeling sealing agent is suitable for oil deposit with the temperature less than or equal to 160 ℃ and the mineralization degree less than 100 multiplied by 103 mg/L，Ca2 +、Mg2+The sum of the concentrations is less than 1200mg/L, and the oil reservoir permeability range is 0.05 multiplied by 103μm2-5000×103μm2CO of2And (4) driving.
Preferably, when the foam channeling sealing agent is used for indoor experiments, when the mass concentration is 0.5%, the foaming volume is not less than 195mL, and the half-life period is not less than 65 min; when the mass concentration is 1.0 percent, the corrosion inhibition rate is not lower than 73 percent.
Compared with the prior art, the invention has the advantages and positive effects that:
1. the invention provides heavy oil reservoir CO2The foam channeling sealing agent for flooding has good foaming and foam stabilizing performance, strong temperature resistance and hard water resistance, and has certain corrosion inhibition performance;
2. the invention provides heavy oil reservoir CO2The foam channeling sealing agent for flooding can adapt to the change of formation water and oil reservoir permeability, can greatly reduce the addition of a corrosion inhibitor in the construction process, and has no influence on crude oil demulsification and later processing;
3. the invention provides heavy oil reservoir CO2The flooding foam channeling sealing agent has good solubility, simple and easy field preparation, high cost performance, good safety performance, no toxicity, no harm, no peculiar smell and the like.
Detailed Description
In order to more clearly and specifically describe the heavy oil reservoir CO provided by the embodiment of the invention2The technical scheme of the embodiment of the invention will be clearly and completely described below, and obviously, the described embodiment is only a part of the embodiment of the invention, but not all of the embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for measuring the product performance comprises the following steps:
1. heavy oil reservoir CO2Measurement of foaming volume and half-life period of flooding foam channeling sealing agent
The product was tested for lather volume, foam half life using a multi-parameter dynamic foam assessor (TECLIS, france).
1.1 starting the super constant temperature water bath to stabilize the temperature of the super constant temperature water bath at 50 +/-0.1 ℃, and simultaneously placing 0.5 percent of foam channeling sealing agent solution in the water bath for preheating.
1.2 opening the power switch of the multi-parameter dynamic foam evaluation instrument and high-purity CO2(purity > 99.99%) air source switch. Before the experiment, the inner wall of the test tube is washed by distilled water, then the inner wall of the test tube is washed by the solution to be tested, and the washing is completely sufficient until no residual foam exists on the inner wall.
1.3 after the calibration is qualified, setting the air flow rate to be 100mL/min, setting the inflation time to be 100s, clicking 'start', entering a multi-parameter dynamic evaluation interface, and starting the experiment. And after the air inflation is finished, closing the air source. During the experiment, the observation is carried out until the half-life period of the foam appears, and the click is stopped, so that the experiment is ended.
1.4 drawing the change curve of instantaneous foam Volume (VF) along with time (t), taking the maximum instantaneous volume of foam generated after gas is filled into the test tube as the foaming volume, and finding out that the time taken for the foam volume to decay from the maximum to half is the foam half-life (t)1/2F)。
2. Heavy oil reservoir CO2Determination of corrosion inhibition rate of foam channeling sealing agent for flooding
And (3) carrying out corrosion inhibition rate test on the product by adopting a normal-pressure static corrosion rate and corrosion inhibition rate measuring method.
2.1 adding 1000mL and 990mL of test medium into two 1000mL test bottles respectively according to the method of SY/T5273-2000-3.6.6, wherein the test bottle added with 1000mL of test medium is used as a blank, and the other bottle is added with 10mL of foam channeling sealing agent solution with the concentration of 1 percent and mixed uniformly; the treated test pieces are hung in two test bottles respectively, and 3 test pieces are hung in parallel to seal the bottle mouth quickly.
2.2 placing the sealed test bottle in a water bath kettle or a thermostat, keeping the temperature at 80 +/-2 ℃, and standing for 7 d. After the test period of 7 days, the test piece was taken out and subjected to post-treatment with 3.6.10 in SY/T5273-2000.
2.3 Corrosion inhibition Rate calculated according to the following formula
In the formula: dp-inhibition rate,%; delta m0-weight loss of test piece, g, for blank test; delta m-weight loss, g, of test piece with corrosion inhibitor added.
Example 1
Adding 170Kg of water into a reaction kettle, controlling the temperature at 40 ℃, and adding 100Kg of Na into the reaction kettle under normal stirring5P3O10After complete dissolution, slowly adding 30Kg of hydroxyethyl cellulose gradually, keeping the original rotating speed, continuously stirring and dissolving, then sequentially adding 600Kg of alpha-alkenyl sodium sulfonate and 100Kg of quaternary ammonium salt type imidazoline, fully stirring and uniformly mixing to obtain uniform and transparent CO for the heavy oil reservoir2The foam channeling sealing agent is used for driving.
The obtained foam channeling sealing agent is respectively measured for foaming volume, half-life period and corrosion inhibition rate according to the product performance measuring method, and the measuring result is as follows:
example 2
185Kg of water is added into a reaction kettle, the temperature is controlled to be 55 ℃, 125Kg of Na is added into the reaction kettle under normal stirring5P3O10After complete dissolution, slowly adding 40Kg of hydroxyethyl cellulose gradually, keeping the original rotating speed, continuously stirring and dissolving, then sequentially adding 500Kg of alpha-alkenyl sodium sulfonate and 150Kg of quaternary ammonium salt type imidazoline, fully stirring and uniformly mixing to obtain uniform and transparent CO for the heavy oil reservoir2The foam channeling sealing agent is used for driving.
The obtained foam channeling sealing agent is respectively measured for foaming volume, half-life period and corrosion inhibition rate according to the product performance measuring method, and the measuring result is as follows:
example 3
Adding 175Kg of water into a reaction kettle, controlling the temperature at 60 ℃, and adding 115Kg of Na into the reaction kettle under normal stirring5P3O10After complete dissolution, gradually slowly adding 35Kg of hydroxyethyl cellulose, keeping the original rotating speed, continuously stirring and dissolving, then sequentially adding 550Kg of alpha-alkenyl sodium sulfonate and 125Kg of quaternary ammonium salt type imidazoline, fully stirring and uniformly mixing to obtain transparent CO for the heavy oil reservoir2The foam channeling sealing agent is used for driving.
The obtained foam channeling sealing agent is respectively measured for foaming volume, half-life period and corrosion inhibition rate according to the product performance measuring method, and the measuring result is as follows:
example 4
Adding 200Kg of water into a reaction kettle, controlling the temperature at 50 ℃, and adding 150Kg of Na into the reaction kettle under normal stirring5P3O10After complete dissolution, gradually slowly adding 50Kg of hydroxyethyl cellulose, keeping the original rotating speed, continuously stirring and dissolving, then sequentially adding 400Kg of alpha-alkenyl sodium sulfonate and 200Kg of quaternary ammonium salt type imidazoline, fully stirring and uniformly mixing to obtain transparent CO for the heavy oil reservoir2The foam channeling sealing agent is used for driving.
The obtained foam channeling sealing agent is respectively measured for foaming volume, half-life period and corrosion inhibition rate according to the product performance measuring method, and the measuring result is as follows:
example 5
Adding 195Kg of water into the reaction kettle, controlling the temperature at 45 ℃,under normal stirring, 135Kg of Na is added into the reaction kettle5P3O10After complete dissolution, gradually slowly adding 45Kg of hydroxyethyl cellulose, continuously stirring and dissolving at the original rotating speed, then sequentially adding 450Kg of alpha-alkenyl sodium sulfonate and 175Kg of quaternary ammonium type imidazoline, fully stirring and uniformly mixing to obtain transparent CO for the heavy oil reservoir2The foam channeling sealing agent is used for driving.
The obtained foam channeling sealing agent is respectively measured for foaming volume, half-life period and corrosion inhibition rate according to the product performance measuring method, and the measuring result is as follows:
Claims (7)
1. heavy oil reservoir CO2The foam channeling sealing agent for the flooding is characterized in that the mass concentration of alpha-alkenyl sulfonate in the foam channeling sealing agent is 40-60%, the mass concentration of quaternary ammonium salt type imidazoline is 10-20%, the mass concentration of hydroxyethyl cellulose is 3-5%, and Na is added5P3O10The mass concentration of the water is 10-15 percent, and the balance is water;
the molecular formula of the alpha-alkenyl sulfonate is as follows:
R1-CH2＝CH-(CH2)n-SO3M
wherein R is1Is alkyl with 9-13 carbons, n is any integer of 1-3, M is selected from Na+Or K+；
The molecular formula of the quaternary ammonium salt imidazoline is as follows:
wherein R is2Is (CH)2)nCOO-Or (CH)2)nSO3 -N is an integer of 1 to 4, R3Is alkyl with the carbon number less than 4;
the molecular formula of the hydroxyethyl cellulose is as follows:
wherein R is H or
x is 1 or 2, and n is any integer selected from 150 and 7500.
2. The heavy oil reservoir CO of claim 12The preparation method of the foam channeling sealing agent for the flooding is characterized by comprising the following steps of:
adding a certain amount of water into a reaction kettle, adding Na into the reaction kettle under stirring at the reaction temperature of 40-60 DEG C5P3O10Up to Na5P3O10Dissolving;
then slowly adding hydroxyethyl cellulose into the reaction kettle, and continuously stirring until the hydroxyethyl cellulose is dissolved;
then sequentially adding alpha-alkenyl sulfonate and quaternary ammonium type imidazoline into the reaction kettle, and stirring and uniformly mixing to obtain the heavy oil reservoir CO2The foam channeling sealing agent is used for driving.
3. The process according to claim 2, wherein water and Na are added to the reaction5P3O10The mass ratio of the hydroxyethyl cellulose to the hydroxyethyl cellulose is (4.0-5.7): (3.0-3.4): 1.0.
4. The production method according to claim 2, wherein the mass ratio of the α -alkenylsulfonate, the quaternary ammonium imidazoline, and the water in the reaction is (2.0-6.0):1.0: (1.0-1.7).
5. The heavy oil reservoir CO of claim 12Foam channeling sealing agent for flooding in heavy oil reservoir CO2Application in driving.
6. Use according to claim 5, wherein the foam isThe channeling sealing agent is suitable for oil deposit with temperature less than or equal to 160 deg.C and degree of mineralization less than 100X 103mg/L，Ca2+、Mg2+The sum of the concentrations is less than 1200mg/L, and the oil reservoir permeability range is 0.05 multiplied by 103μm2-5000×103μm2CO of2And (4) driving.
7. The use according to claim 5, wherein when the foam channeling sealing agent is used in indoor experiments, the foaming volume is not less than 195mL and the half-life is not less than 65min when the foam channeling sealing agent is added at the mass concentration of 0.5%; when the mass concentration is 1.0 percent, the corrosion inhibition rate is not lower than 73 percent.
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| CN111732603B (en) * | 2020-08-27 | 2020-11-13 | 山东新港化工有限公司 | Temperature-resistant and salt-resistant fracturing fluid imbibition agent and preparation method and application thereof |
| CN115895626B (en) * | 2022-11-09 | 2023-10-10 | 山东新港化工有限公司 | Low permeability reservoir potentiating CO 2 Corrosion inhibition type nano foam oil washing agent for driving and preparation method and application thereof |
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