CN109913192A - Desalination de-plugging agent - Google Patents
Desalination de-plugging agent Download PDFInfo
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- CN109913192A CN109913192A CN201910281079.2A CN201910281079A CN109913192A CN 109913192 A CN109913192 A CN 109913192A CN 201910281079 A CN201910281079 A CN 201910281079A CN 109913192 A CN109913192 A CN 109913192A
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- desalination
- plugging agent
- agent
- acid
- corrosion inhibiter
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Abstract
The invention discloses a kind of desalination de-plugging agent, the desalination agent is by high efficiency composition complexing agent, high-efficient penetrant, inhibitor, mutual solvent, multi-component high-efficient corrosion inhibiter etc. at being grouped as.The present invention is nontoxic pure organic green product, has stronger inorganic scale solution ration, for inorganic matter blocks in oil/gas well, in water injection well, can have an effect with alumino-silicate, form soluble chelating object, play the role of corrosion clay minerals；Energy and Ca2+、Mg2+Plasma forms stable water-soluble substances, releases and blocks caused by inorganic scale；Stable complex system can be formed with iron ion prevents secondary precipitation；It can interact with clay mineral, inhibit clay swell migration, the dirts such as calcium sulfate, barium sulfate, the strontium sulfate that strong acid system can not dissolve can be dissolved, to reach comprehensive the problem of releasing inorganic matter blocking, achieve the purpose that desalination de-plugging.
Description
Technical field
The invention belongs to the auxiliary agents for oil exploitation, and in particular to a kind of desalination de-plugging agent.
Background technique
Acidizing Technology is one of oil/gas well operation, volume increase and major measure of water injection well stimulation.Acidification is existed by acid solution
The intergranular of formation pore, hole and flowing and reaction in microcrack, to dissolve near wellbore stratum in drilling well, complete well, well workover
And various solid phase particles and impurity during water filling, augmented injection etc., its injury to in-place permeability is released, the infiltration of fluid is dredged
Saturating channel, to restore and improve a kind of technology of oily well capacity.Conventional Acidizing Technology uses mineral acid acidified at present,
It results in blockage with secondary precipitation, penetration depth not enough (hydrochloric acid reaction speed is too fast), corroded pipeline (strong acid), drain is not in time
The disadvantages of causing formation damage, to cause acidizing effect failure or validity period short.
Summary of the invention
The present invention be in order to overcome exist in the prior art it is mineral acid acidified result in blockage with secondary precipitation, penetration depth
Not enough, the disadvantages of corroded pipeline, drain causes formation damage not in time and propose, the purpose is to provide a kind of desalination de-plugging
Agent.
The technical scheme is that
A kind of desalination de-plugging agent, the component and mass percent of the desalination de-plugging agent are as follows:
Chelating agent 70% ~ 80%；
Bleeding agent 5% ~ 10%；
Inhibitor 5% ~ 10%；
Mutual solvent 5% ~ 10%；
Multi-component high-efficient corrosion inhibiter 0.5 ~ 1%.
The component and mass percent of the desalination de-plugging agent are as follows:
Chelating agent 80%；
Bleeding agent 9%；
Inhibitor 5%；
Mutual solvent 5%；
Multi-component high-efficient corrosion inhibiter 1%.
The chelating agent is small molecular organic acid, yellow humic acid, hydroxyethylenediamine triacetic acid, diethyl triamine pentaacetic acid composition；
The bleeding agent is Long carbon chain enol base polyoxyethylene ether；
The inhibitor is poly-quaternary ammonium salt；
The mutual solvent is ethylene glycol monobutyl ether；
The multi-component high-efficient corrosion inhibiter is that Imidazoline corrosion inhibitor is compounded with alkynol class corrosion inhibiter.
The small molecular organic acid is formic acid.
The chelating agent small molecular organic acid, yellow humic acid, hydroxyethylenediamine triacetic acid and diethyl triamine pentaacetic acid matter
Amount is than being 1:1:7:1.
The Imidazoline corrosion inhibitor is diethylenetriamine imidazoline.
The alkynol class corrosion inhibiter is methylparafynol.
It is 1:1 that Imidazoline corrosion inhibitor, which compounds mass ratio with alkynol class corrosion inhibiter, in the multi-component high-efficient corrosion inhibiter.
The desalination de-plugging agent is transparency liquid to weak yellow liquid, and specific gravity is 1.14 kg/L ~ 1.17kg/L.
The beneficial effects of the present invention are:
The present invention provides a kind of desalination de-plugging agent, it is nontoxic be pure organic green product, in oil/gas well,
Inorganic matter blocks in water injection well.It can have an effect with alumino-silicate, form soluble chelating object, play corrosion clay minerals
Effect；Energy and Ca2+、Mg2+Plasma forms stable water-soluble substances, releases and blocks caused by inorganic scale；It is formed with iron ion
Stable complex system prevents secondary precipitation；Its reactant can interact with clay mineral, inhibit clay swell migration；
The dirts such as calcium sulfate, barium sulfate, strontium sulfate that dissolvable strong acid system can not dissolve.Release what inorganic matter blocked to reach comprehensive
Problem achievees the purpose that desalination de-plugging.
Specific embodiment
Desalination de-plugging agent of the present invention is described in detail below with reference to embodiment:
A kind of desalination de-plugging agent, the component and mass percent of the desalination de-plugging agent are as follows:
Chelating agent 70% ~ 80%；
Bleeding agent 5% ~ 10%；
Inhibitor 5% ~ 10%；
Mutual solvent 5% ~ 10%；
Multi-component high-efficient corrosion inhibiter 0.5 ~ 1%.
The component and mass percent of the desalination de-plugging agent are as follows:
Chelating agent 80%；
Bleeding agent 9%；
Inhibitor 5%；
Mutual solvent 5%；
Multi-component high-efficient corrosion inhibiter 1%.
The chelating agent is small molecular organic acid, yellow humic acid, hydroxyethylenediamine triacetic acid (HEDTA), five second of diethylamine
Sour (DPTA) composition；Can effectively complexing calcium, magnesium, iron, silicate plasma, play the role of efficient de-plugging.
The bleeding agent is Long carbon chain enol base polyoxyethylene ether；It can effectively be disintegrated with good salt tolerant permeability
Dispersion is adhered to the greasy filth near screen casing, improves compound complex agent dissolved efficiency, while can substantially reduce the surface of aqueous solution
Tension improves de-plugging injection efficiency.
The inhibitor is clay stabilizer, and clay is in balanced situation without being displaced with formation fluid before acidification,
But in acidification, clay and acid solution are then in unbalanced situation, easily clay swell are caused to spread, the clay of these diffusions
Grain flows meeting Severe blockage channel with acid solution.Clay stabilizer can be such that clay does not expand, indiffusion, not cause stratum stifled
Plug.The inhibitor is poly-quaternary ammonium salt；
The mutual solvent is that ethylene glycol monobutyl ether can be improved with good solvability and excellent surfactant
The synergistic effect of the ingredients such as complexing agent and bleeding agent.
The multi-component high-efficient corrosion inhibiter is to effectively prevent water injection well using state-of-the-art a variety of high-efficient corrosion inhibitor compoundings
The corrosion of oil, casing and underground water-injection process.The multi-component high-efficient corrosion inhibiter is Imidazoline corrosion inhibitor and the inhibition of alkynol class
Agent compounding.
The small molecular organic acid is formic acid.
The chelating agent small molecular organic acid, yellow humic acid, hydroxyethylenediamine triacetic acid and diethyl triamine pentaacetic acid matter
Amount is than being 1:1:7:1.
The Imidazoline corrosion inhibitor is diethylenetriamine imidazoline.
The alkynol class corrosion inhibiter is methylparafynol.
It is 1:1 that Imidazoline corrosion inhibitor, which compounds mass ratio with alkynol class corrosion inhibiter, in the multi-component high-efficient corrosion inhibiter.
The desalination de-plugging agent is transparency liquid to weak yellow liquid, and specific gravity is 1.14 kg/L ~ 1.17kg/L.
Embodiment 1
A kind of desalination de-plugging agent, the component and mass percent of the desalination de-plugging agent are as follows:
Chelating agent 75%；
Bleeding agent 10%；
Inhibitor 9%；
Mutual solvent 5%；
Multi-component high-efficient corrosion inhibiter 1%.
Embodiment 2
A kind of desalination de-plugging agent, the component and mass percent of the desalination de-plugging agent are as follows:
Chelating agent 78%；
Bleeding agent 8%；
Inhibitor 8%；
Mutual solvent 5%；
Multi-component high-efficient corrosion inhibiter 1%.
Embodiment 3
A kind of desalination de-plugging agent, the component and mass percent of the desalination de-plugging agent are as follows:
Chelating agent 80%；
Bleeding agent 9%；
Inhibitor 5%；
Mutual solvent 5%；
Multi-component high-efficient corrosion inhibiter 1%.
Embodiment 4
A kind of desalination de-plugging agent, the component and mass percent of the desalination de-plugging agent are as follows:
Chelating agent 70%；
Bleeding agent 15%；
Inhibitor 9%；
Mutual solvent 5%；
Multi-component high-efficient corrosion inhibiter 1%.
The plugging removal effect of product of the present invention is tested:
One, it is applied to pipeline CaCO3Dirty sample solute effect
Certain land oil field pipeline CaCO3The experimental data are shown in the following table for dirty sample dissolution rate:
After desalination de-plugging agent of the present invention dissolution, CaCO3Dirty sample dissolution is obvious, and dissolution rate is generally up to 80% or more, part sample
Product dirt sample all dissolves.
Two, it is applied to Fe dirt dissolution experiment
Certain land oil field screen erosion iron rust dissolution experiment data is as follows:
Desalination de-plugging agent of the present invention is obvious for iron rust/dirt solute effect, and molten dirt rate is up to 63.5% or more, generally more than 70%.
Three, comprehensive dirty matter is dissolved using desalination de-plugging agent of the present invention to test
Contain CaCO in certain land oil field pit shaft dirt sample3、CaSO4, a small amount of clay of corrosion iron dirt, dissolution experiment data are as follows:
Desalination de-plugging agent of the present invention is obvious for comprehensive dirty sample solute effect, and as time increases, solute effect is more preferable.When
For dissolution time at 24 hours, molten dirt rate was up to 73.5%.
The invention has the following advantages that
1. having an effect with alumino-silicate, soluble chelating object is formed, corrosion clay minerals are played the role of
2. and Ca2+、Mg2+Ion forms stable water-soluble substances, releases and blocks caused by inorganic scale
3. forming stable complexing body with dissolved matter, prevent secondary precipitation from generating
There are mainly two types of for the secondary precipitation formed after general inorganic acidification:
A. fluoride precipitates.Injection water contains a large amount of Ca2+, Na+, K+Ion contains anorthite in sandstone to some extent, and sodium is long
Stone, first feldspar contain calcareous mineral in cement, they encounter hydrofluoric acid CaF easily generated2, Na2SiF6, K2SiF6Precipitating.It is anti-
Answer equation as follows:
Ca2++2F-= CaF2↓, CaCO3+2HF=CaF3↓+H2O+CO2↑
Hydrofluoric acid reacts the fluosilicic acid generated with sandstone and meets K+, Na+Ion generates K2SiF5, Na2SiF6Precipitating:
2K++SiF62-= K2SiF5↓, 2Na++ SiF62-= Na2SiF5↓
These precipitatings can block pore constriction, reduce acidizing effect.
B. hydroxide precipitates.Due to the corrosion of tubing string, in the iron compound and sandstone oil-gas Layer that liquid is brought into of constructing
The dissolution of iron-bearing mineral can all contain a certain amount of ferric ion after acidification.When residual acid strength drops to a certain degree, PH
When value is greater than 2.2, start to generate Fe (OH)3Gelatinous precipitate blocks pore throat, reduces permeability, keeps acidizing effect poor or even nothing
Effect.
Fe2O3+6HCL = 2FeCL3+3H2O, FeCL3+3H2O = Fe(OH)3↓+3HCL
Chelating agent in this product is can to interact with metal ion (cooperation), thus change metal ion chemistry property
Chemical reagent.Outside except alkali metal (Na, K etc.), almost all of metal ion can be chelated.Chelating agent and metal ion
Between bonding be reversible.Complex reaction can occur with metal ion, prevent harmful precipitating, dissolution of scale can not only
Removing acid-soluble dirt, the acid-soluble dirts non-to calcium sulfate, barium sulfate etc. such as calcium carbonate also has very well.
4. reactant can interact with clay mineral, inhibit clay swell migration
Inhibitor in this product is middle molecule polyquaternium, can be interacted with stratum clay mineral, has and inhibits well
The effect of clay swell particle migration.Cationic Polymers Containing Quaternary Ammonium Salts are glued by positive charged group on macromolecular chain and negatively charged
Strong chemisorption occurs for the electrostatic attraction between soil particle, to inhibit the dispersion of clay and the migration of particle, plays stabilization
The effect of clay and particle.
5. non-strong acid class complexion solutions blocking agent, low-corrosiveness is highly-safe, it is corrosion-free to down-hole casing and water injection manifold group and
Damage
6. dirts such as the calcium sulfate that dissolvable strong acid system can not dissolve, barium sulfate, strontium sulfates
7. slow system is, it can be achieved that removing clog in deep reservoir is handled, plugging removal effect is stronger
The advantages of inorganic acid (referring mainly to hydrochloric acid here) is that solution ration is strong, and price is lower.But hydrochloric acid is reacted with carbonate rock
Quickly, sour EFFECTIVE RANGE is short for speed.Acid solution flows in small duct, and the activity of most a few minutes acid just exhausts,
Only several centimetres to more than ten centimetres of penetration range, acid solution flows in crack, it is only necessary to which a few minutes to more than ten minutes, acid concentration just reduce
Below 3%, penetration range also only has several meters to more than ten meters.
This product is Organic Acid System, and reaction speed is slow, and EFFECTIVE RANGE is long.
Claims (9)
1. a kind of desalination de-plugging agent, it is characterised in that: the component and mass percent of the desalination de-plugging agent are as follows:
Chelating agent 70% ~ 80%；
Bleeding agent 5% ~ 10%；
Inhibitor 5% ~ 10%；
Mutual solvent 5% ~ 10%；
Multi-component high-efficient corrosion inhibiter 0.5 ~ 1%.
2. desalination de-plugging agent according to claim 1, it is characterised in that: the component and quality percentage of the desalination de-plugging agent
Than are as follows:
Chelating agent 80%；
Bleeding agent 9%；
Inhibitor 5%；
Mutual solvent 5%；
Multi-component high-efficient corrosion inhibiter 1%.
3. desalination de-plugging agent according to claim 1, it is characterised in that:
The chelating agent is small molecular organic acid, yellow humic acid, hydroxyethylenediamine triacetic acid, diethyl triamine pentaacetic acid composition；
The bleeding agent is Long carbon chain enol base polyoxyethylene ether；
The inhibitor is poly-quaternary ammonium salt；
The mutual solvent is ethylene glycol monobutyl ether；
The multi-component high-efficient corrosion inhibiter is that Imidazoline corrosion inhibitor is compounded with alkynol class corrosion inhibiter.
4. the desalination de-plugging agent stated according to claim 3, it is characterised in that: the small molecular organic acid is formic acid.
5. desalination de-plugging agent according to claim 3, it is characterised in that: the chelating agent small molecular organic acid, yellow corruption
The mass ratio for growing acid, hydroxyethylenediamine triacetic acid and diethyl triamine pentaacetic acid is 1:1:7:1.
6. desalination de-plugging agent according to claim 3, it is characterised in that: the Imidazoline corrosion inhibitor is diethylenetriamine
Imidazoline.
7. desalination de-plugging agent according to claim 3, it is characterised in that: the alkynol class corrosion inhibiter is methylparafynol.
8. desalination de-plugging agent according to claim 3, it is characterised in that: imidazoline type in the multi-component high-efficient corrosion inhibiter
It is 1:1 that corrosion inhibiter, which compounds mass ratio with alkynol class corrosion inhibiter,.
9. desalination de-plugging agent according to claim 1, it is characterised in that: the desalination de-plugging agent is transparency liquid to yellowish
Color liquid, specific gravity are 1.14 kg/L ~ 1.17kg/L.
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Cited By (5)
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| CN112094633A (en) * | 2020-10-29 | 2020-12-18 | 四川中汇安达石油化工有限公司 | Chelating type blocking remover and preparation method and application thereof |
| CN112410004A (en) * | 2020-12-01 | 2021-02-26 | 成都欣明化工有限公司 | Novel gas well blocking remover |
| CN113105879A (en) * | 2021-04-02 | 2021-07-13 | 长江大学 | Composite salt-resistant stuck remover and application thereof |
| CN114058350A (en) * | 2021-11-26 | 2022-02-18 | 中海油田服务股份有限公司 | Chlorite blocking remover, preparation method, application and blocking removing method thereof |
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| CN112410004A (en) * | 2020-12-01 | 2021-02-26 | 成都欣明化工有限公司 | Novel gas well blocking remover |
| CN113105879A (en) * | 2021-04-02 | 2021-07-13 | 长江大学 | Composite salt-resistant stuck remover and application thereof |
| CN114058350A (en) * | 2021-11-26 | 2022-02-18 | 中海油田服务股份有限公司 | Chlorite blocking remover, preparation method, application and blocking removing method thereof |
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Application publication date: 20190621 |