CN110564396A - Deep penetration chelating environment-friendly online blockage removal system and preparation method thereof - Google Patents
Deep penetration chelating environment-friendly online blockage removal system and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a deep penetration chelating environment-friendly online blockage removing system which is characterized by comprising the following components in parts by weight: comprises the following raw materials in percentage by weight: 2 to 5 percent of matrix chain scission agent, 10 to 30 percent of solid chelating acid, 5 to 20 percent of clay stabilizer, 10 to 20 percent of synergist, 3 to 10 percent of corrosion inhibitor and the balance of water. Compared with the conventional acid liquor, the system has slow reaction with acid rocks, and the reaction rate of the acid rocks is only about one tenth of that of hydrochloric acid. In addition, the system has strong chelating capacity for metal ions such as iron ions, calcium ions and the like, can prevent the metal ions from forming precipitates in residual acid, and avoids secondary damage to a reservoir.
Description
Technical Field
The invention relates to an environment-friendly blockage removing system for increasing the yield and the injection of an oil field, which does not contain H + and does not need to be drained back after construction, in particular to a deep penetration chelating environment-friendly online blockage removing system. The system is suitable for low-permeability acid rock reservoirs, can realize online small-displacement injection under the condition of not stopping the well for a water injection well short of injection for a long time, can efficiently chelate complex scale of a shaft and a stratum, removes deep blockage, recovers the permeability of the reservoirs, increases the water injection rate and improves the yield of an oil-gas well.
Background
Conventional acidification is an effective technical measure for increasing the yield of oil and gas wells and increasing the injection of water wells. The stratum permeability is recovered mainly through the dissolution and corrosion of the matrix acid liquid on the cementing material of rock or the blocking material in the stratum pores and cracks. In the process of acidification, the most significant influence on the effective acidification effect is the components of the acid liquor. The acid liquor provided should satisfy: the corrosion capacity is strong, the blockage in the formation gap can be effectively dissolved, and the generated product can be dissolved in the residual acid; the compatibility with reservoir fluid is good, the performance of the acid liquor prepared after the chemical additive is added can meet the requirements of site operation, and the reservoir is not polluted; the transportation and the construction are convenient and safe; fourthly, the price is low and the source of the goods is convenient.
At present, hydrochloric acid, earth acid and other systems are commonly used in various oil and gas fields, but the acid systems have high reaction speed with the wall surface of rock and short effective plugging removal action distance, and can not effectively reform the far-well area; in addition, in matrix acidification, particularly sandstone acidification, the skeleton of the matrix is easily damaged by conventional inorganic acid, so that sand is produced near a well zone to cause instability of a well wall, meanwhile, fluosilicate and the like which are byproducts of a chemical reaction between hydrofluoric acid and aluminosilicate can also react for two or three times to form a series of insoluble colloidal precipitates, and metal ions generated after acid solution corrosion easily form metal precipitates to cause secondary damage to a reservoir. In order to overcome the defects, a deep penetration chelating environment-friendly online blockage removal system is developed.
Disclosure of Invention
The invention aims to overcome the problems of high reaction speed and short effective action distance of conventional acidification and rock, and provides a deep penetration chelating environment-friendly online deblocking system which has slow reaction with the rock, can effectively enlarge the deblocking radius and improve the deblocking effect, has super-strong chelating effect, has strong chelating capacity for iron ions, calcium ions, barium ions, strontium ions, magnesium ions and other metal ions in a stratum, and can effectively prevent the secondary damage to the stratum caused by compound precipitation formed by the metal ions.
In order to achieve the purpose, the invention provides the following technical scheme:
The invention provides a preparation method of a deep penetration chelating environment-friendly online blockage relieving system. The invention mainly comprises the following components: 2 to 5 percent of matrix chain scission agent, 10 to 30 percent of solid chelating agent, 5 to 20 percent of clay stabilizer, 10 to 20 percent of synergist, 3 to 10 percent of corrosion inhibitor and the balance of water.
The matrix chain scission agent is one or two polymers of sodium persulfate, potassium persulfate and ammonium persulfate.
The solid chelating acid is selected from one or more of ethylenediamine tetraacetic acid, citric acid, hydroxyethyl ethylenediamine triacetic acid, amino trimethylene phosphonic acid, ethylenediamine tetramethylene phosphonic acid, glycolic acid and amino triacetic acid.
The clay stabilizer is selected from one or more of potassium chloride, ammonium chloride, polyquaternary ammonium salt and quaternary ammonium salt.
The polyquaternary ammonium salt is selected from one or a mixture of two of poly dimethyl diallyl ammonium chloride and poly allyl trimethyl ammonium chloride.
The quaternary ammonium salt is selected from one or more of tetramethylammonium chloride, allyltrimethylammonium chloride, dodecyltrimethylammonium chloride and dodecyldimethylbenzylammonium chloride.
The synergist is one or more selected from ammonium citrate, sodium gluconate, sodium tartrate and dihydroxyethyl glycine.
The corrosion inhibitor is prepared by compounding cinnamaldehyde and hexamethylenetetramine according to the mass ratio of 1: 2-4.
the preparation method of the deep penetration chelating environment-friendly online blockage relieving system comprises the following steps: sequentially adding water and chelating acid into a reaction kettle at room temperature under the stirring condition, stirring for 20min, adding a synergist and a clay stabilizer into the reaction kettle, continuously stirring for 30min, finally adding cinnamaldehyde and hexamethylenetetramine in a certain proportion into the reaction kettle, and stirring for 15min to obtain the deep penetration chelating environment-friendly online unblocking system.
Compared with the existing acidification blockage removal system, the method has the following advantages:
(1) The reaction rate with acid rock is obviously lower than that of the existing acidizing fluid system, the plugging removal radius can be effectively enlarged, and the yield of the oil-gas well is improved.
(2) The chelating agent has strong chelating capacity, can effectively chelate metal ions such as iron ions, calcium ions, magnesium ions, barium ions and the like in the residual liquid, prevents the formation of secondary precipitation, and avoids secondary damage of a reservoir.
(3) The flow-back liquid is not treated and can directly enter a process pipe network.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
The invention provides a technical scheme that: a deeply-penetrated chelating environment-friendly online blockage removing system is characterized in that: comprises the following raw materials in percentage by weight: 2 to 5 percent of matrix chain scission agent, 10 to 30 percent of solid chelating acid, 5 to 20 percent of clay stabilizer, 10 to 20 percent of synergist, 3 to 10 percent of corrosion inhibitor and the balance of water. The matrix chain scission agent is one or two polymers of sodium persulfate, potassium persulfate and ammonium persulfate.
Wherein the solid chelating acid is selected from one or more of ethylenediamine tetraacetic acid, citric acid, hydroxyethyl ethylenediamine triacetic acid, aminotrimethylene phosphonic acid, ethylenediamine tetramethylene phosphonic acid, glycolic acid and aminotriacetic acid.
Wherein the clay stabilizer is selected from one or more of potassium chloride, ammonium chloride, polyquaternary ammonium salt and quaternary ammonium salt.
Wherein the polyquaternary ammonium salt is selected from one or a mixture of two of poly dimethyl diallyl ammonium chloride and poly allyl trimethyl ammonium chloride.
wherein the quaternary ammonium salt is selected from one or more of tetramethylammonium chloride, allyltrimethylammonium chloride, dodecyltrimethylammonium chloride and dodecyldimethylbenzylammonium chloride.
Wherein the synergist is selected from one or more of ammonium citrate, sodium gluconate, sodium tartrate and dihydroxyethyl glycine.
The corrosion inhibitor is prepared by compounding cinnamaldehyde and hexamethylenetetramine according to the mass ratio of 1: 2-4.
Example 1
under the condition of stirring at room temperature, sequentially adding 35 parts of clear water, 5 parts of ethylenediamine tetraacetic acid, 15 parts of citric acid and 3 parts of ethylenediamine tetramethylene phosphonic acid into a reaction kettle, stirring for 20min, then adding 15 parts of sodium tartrate and 18 parts of poly dimethyl diallyl ammonium chloride into the reaction kettle, continuously stirring for 30min, finally adding 9 parts of a mixture of cinnamaldehyde and hexamethylenetetramine (the ratio of cinnamaldehyde to hexamethylenetetramine is 1: 2) and 2 parts of sodium persulfate into the reaction kettle, and continuously stirring for 15min to obtain a finished product of the deep-penetration chelating environment-friendly online unblocking system.
The deep penetration chelating environment-friendly online deblocking system is prepared into a 20% solution to test the corrosion performance of the solution, the corrosion rate of the system is found to be equivalent to that of a conventional hydrochloric acid system, the acid-rock reaction rate of the system is further tested, the average acid-rock reaction rate of the deep penetration chelating environment-friendly online deblocking system at 60 ℃ is 0.086g/min, the acid-rock reaction rate of the hydrochloric acid system at 60 ℃ is 0.81g/min, and the retarding effect is obvious. And measuring the chelating metal ion capacity of the deep penetration chelating environment-friendly on-line blockage removing system by gradually dripping the iron ion standard solution into the residual liquid. Tests show that each milliliter of residual liquid can chelate 7.1mg of iron ions, 4.6mg of magnesium ions, 5.8mg of calcium ions, 6.3mg of barium ions and 3.9mg of strontium ions, can effectively prevent metal ions from forming precipitates in the residual liquid, and avoids causing secondary damage.
Example 2
Under the condition of stirring at room temperature, sequentially adding 40 parts of clear water, 6 parts of glycolic acid, 15 parts of citric acid and 3 parts of amino trimethylene phosphonic acid into a reaction kettle, stirring for 20min, then adding 12 parts of sodium gluconate and 20 parts of KCl into the reaction kettle, continuously stirring for 30min, finally adding 5 parts of a mixture of cinnamaldehyde and hexamethylenetetramine (the ratio of cinnamaldehyde to hexamethylenetetramine is 1: 3) and 2 parts of ammonium persulfate, and continuously stirring for 15min to obtain a finished product of the deep penetration chelating environment-friendly online deblocking system.
The deep penetration chelating environment-friendly online deblocking system is prepared into a 20% solution to test the corrosion performance of the solution, the corrosion rate of the system is found to be equivalent to that of a conventional hydrochloric acid system, the reaction rate of the system with acid rock is further tested, the average reaction rate of the deep penetration chelating environment-friendly online deblocking system at 60 ℃ is 0.075g/min, the reaction rate of the hydrochloric acid system at 60 ℃ is 0.81g/min, the reaction rate is only one tenth of that of the hydrochloric acid system, and the retarding effect is very obvious. The capacity of deep penetration chelating environment-friendly on-line blockage removing system for chelating metal ions is measured by gradually dripping iron ion standard solution into the residual liquid, and tests show that each milliliter of the residual liquid can chelate 7.9mg of iron ions, 5.5mg of magnesium ions, 5.8mg of calcium ions, 5.8mg of barium ions and 4.3mg of strontium ions, so that the metal ions can be effectively prevented from forming precipitates in residual acid, and secondary damage is avoided.
Example 3
Under the condition of stirring at room temperature, sequentially adding 35 parts of clear water, 5 parts of hydroxyethyl ethylenediamine triacetic acid, 10 parts of glycolic acid and 8 parts of glycine into a reaction kettle, stirring for 20min, then adding 18 parts of ammonium citrate and 15 parts of polyallyl trimethyl ammonium chloride into the reaction kettle, continuously stirring for 30min, finally adding 9 parts of a mixture of cinnamaldehyde and hexamethylenetetramine (the ratio of cinnamaldehyde to hexamethylenetetramine is 1: 2) and 3 parts of potassium persulfate into the reaction kettle, and continuously stirring for 15min to obtain a finished product of the deep-penetration chelating environment-friendly online unblocking system.
The deep penetration chelating environment-friendly online deblocking system is prepared into a 20% solution to test the corrosion performance of the solution, the corrosion rate of the system is found to be equivalent to that of a conventional hydrochloric acid system, the reaction rate with acid rock is further tested, the average acid rock reaction rate of the deep penetration chelating environment-friendly online deblocking system at 90 ℃ is 0.12g/min, the acid rock reaction rate of the hydrochloric acid system at 90 ℃ is 1.48g/min, and the retarding effect is obvious. The capacity of deep penetration chelating environment-friendly on-line blockage removing system for chelating metal ions is measured by gradually dripping iron ion standard solution into the residual liquid, and each milliliter of the residual liquid can chelate 8.7mg of iron ions, 4.3mg of magnesium ions, 4.7mg of calcium ions, 6.3mg of barium ions and 4.9mg of strontium ions, so that the metal ions can be effectively prevented from forming precipitates in residual acid, and secondary damage is avoided.
example 4
Under the condition of stirring at room temperature, sequentially adding 38 parts of clear water, 5 parts of hydroxyethyl ethylenediamine triacetic acid, 10 parts of citric acid and 10 parts of amino trimethylene phosphonic acid into a reaction kettle, stirring for 20min, then adding 16 parts of dihydroxy glycine and 15 parts of ammonium chloride into the reaction kettle, continuously stirring for 30min, finally adding 6 parts of a mixture of cinnamaldehyde and hexamethylenetetramine (the ratio of cinnamaldehyde to hexamethylenetetramine is 1: 1) and 4 parts of ammonium persulfate, and continuously stirring for 15min to obtain a finished product of the deep-penetration chelating environment-friendly online unblocking system.
The deep penetration chelating environment-friendly online deblocking system is prepared into a 15% solution to test the corrosion performance of the solution, the corrosion rate of the system is found to be equivalent to that of a conventional hydrochloric acid system, the reaction rate of the solution with acid rock is further tested, the average reaction rate of the deep penetration chelating environment-friendly online deblocking system at 70 ℃ is 0.093g/min, the acid rock reaction rate of the hydrochloric acid system at 70 ℃ is 1.07g/min, and the retarding effect is obvious. The capacity of deep penetration chelating environment-friendly on-line blockage removing system for chelating metal ions is measured by gradually dripping iron ion standard solution into the residual liquid, and each milliliter of the residual liquid can chelate 8.2mg of iron ions, 4.8mg of magnesium ions, 5.5mg of calcium ions, 5.3mg of barium ions and 4.4mg of strontium ions, so that the metal ions can be effectively prevented from forming precipitates in residual acid, and secondary damage is avoided.
Example 5
Under the condition of stirring at room temperature, sequentially adding 40 parts of clear water, 5 parts of hydroxyethyl ethylenediamine triacetic acid, 10 parts of citric acid and 10 parts of amino trimethylene phosphonic acid into a reaction kettle, stirring for 20min, then adding 10 parts of dihydroxy glycine and 13 parts of allyl trimethyl ammonium chloride into the reaction kettle, continuously stirring for 30min, finally adding 12 parts of a mixture of cinnamaldehyde and hexamethylenetetramine (the ratio of cinnamaldehyde to hexamethylenetetramine is 1: 3) and 5 parts of ammonium persulfate into the reaction kettle, and continuously stirring for 15min to obtain a finished product of the deep penetration chelating environment-friendly online unblocking system.
The deep penetration chelating environment-friendly online deblocking system is prepared into a 15% solution to test the corrosion performance of the solution, the corrosion rate of the system is found to be equivalent to that of a conventional hydrochloric acid system, the reaction rate with acid rock is further tested, the average acid rock reaction rate of the deep penetration chelating environment-friendly online deblocking system at 60 ℃ is 0.079g/min, the acid rock reaction rate of the hydrochloric acid system at 60 ℃ is 0.81g/min, and the speed slowing effect is obvious. The capacity of deep penetration chelating environment-friendly on-line blockage removing system for chelating metal ions is measured by gradually dripping iron ion standard solution into the residual liquid, each milliliter of residual acid can chelate iron ions 9.1mg, magnesium ions 3.9mg, calcium ions 6.8mg, barium ions 6.3mg and strontium ions 5.9mg, and the residual acid can effectively prevent the metal ions from forming precipitates in the residual acid and avoid causing secondary damage.
Example 6
Under the condition of stirring at room temperature, adding 37 parts of clear water, 3 parts of hydroxyethyl ethylenediamine triacetic acid, 12 parts of glycolic acid and 8 parts of glycine into a reaction kettle in sequence, stirring for 20min, then adding 18 parts of sodium tartrate and 15 parts of dodecyltrimethylammonium chloride into the reaction kettle, continuing to stir for 30min, finally adding 7 parts of a mixture of cinnamaldehyde and hexamethylenetetramine (the ratio of cinnamaldehyde to hexamethylenetetramine is 1: 2.5) and 3 parts of sodium overflowing salt into the reaction kettle, and continuing to stir for 15min to obtain a finished product of the deep penetration chelating environment-friendly online unblocking system.
The deep penetration chelating environment-friendly online deblocking system is prepared into a 20% solution to test the corrosion performance of the solution, the corrosion rate of the system is found to be equivalent to that of a conventional hydrochloric acid system, the reaction rate of the system and acid rock is further tested, the average acid rock reaction rate of the deep penetration chelating environment-friendly online deblocking system at 90 ℃ is 0.12g/min, the acid rock reaction rate of the hydrochloric acid system at 90 ℃ is 1.48g/min, and the retarding effect is obvious. The capacity of deep penetration chelating environment-friendly on-line blockage removing system for chelating metal ions is measured by gradually dripping iron ion standard solution into the residual liquid, each milliliter of residual acid can chelate iron ions 9.1mg, magnesium ions 5.8mg, calcium ions 6.9mg, barium ions 5.3mg and strontium ions 5.3mg, and the residual acid can effectively prevent the metal ions from forming precipitates in the residual acid and avoid causing secondary damage.
Example 7
Under the condition of stirring at room temperature, sequentially adding 30 parts of clear water, 10 parts of ethylene diamine tetraacetic acid, 10 parts of citric acid and 3 parts of ethylene diamine tetramethylene phosphonic acid into a reaction kettle, stirring for 20min, then adding 15 parts of sodium tartrate and 18 parts of poly dimethyl diallyl ammonium chloride into the reaction kettle, continuously stirring for 30min, finally adding 9 parts of a mixture of cinnamaldehyde and hexamethylene tetramine (the ratio of cinnamaldehyde to hexamethylene tetramine is 1: 2) and one part of ammonium persulfate into the reaction kettle, and continuously stirring for 15min to obtain a finished product of the deep penetration chelating environment-friendly online deblocking system.
The deep penetration chelating environment-friendly online deblocking system is prepared into a 20% solution to test the corrosion performance of the solution, the corrosion rate of the system is found to be equivalent to that of a conventional hydrochloric acid system, the reaction rate of the system with acid rock is further tested, the average reaction rate of the deep penetration chelating environment-friendly online deblocking system at 60 ℃ is 0.086g/min, the reaction rate of the hydrochloric acid system at 60 ℃ is 0.81g/min, and the retarding effect is obvious. The capacity of deep penetration chelating environment-friendly on-line blockage removing system for chelating metal ions is measured by gradually dripping iron ion standard solution into residual liquid, and tests show that each milliliter of residual acid can chelate 7.1mg of iron ions, 4.6mg of magnesium ions, 5.8mg of calcium ions, 6.3mg of barium ions and 3.9mg of strontium ions, so that the metal ions can be effectively prevented from forming precipitates in the residual acid, and secondary damage is avoided.
The blockage removal system is used for blockage removal construction of an M water injection well of a medium-petroleum-and-medium-quality-disguised oil field, the daily injection amount of the M well is about 10M3 before blockage removal, the oil pressure is 32MPa, the water absorption index is 4.4M3/(d & MPa), the daily injection amount of the M well is about 30M3 after blockage removal, the oil pressure is 18.0MPa, the water absorption index is increased to 62.5M 3 (d & lt & gtMPa), and the injection allocation requirement is met. The effective period is 150 days, the accumulated augmented injection is 48129m3 at present, and the augmented injection effect is obvious.
Example 8
Under the condition of stirring at room temperature, sequentially adding 30 parts of clear water, 5 parts of hydroxyethyl ethylenediamine triacetic acid, 15 parts of citric acid and 12 parts of amino trimethylene phosphonic acid into a reaction kettle, stirring for 20min, then adding 15 parts of dihydroxy glycine and 10 parts of ammonium chloride into the reaction kettle, continuously stirring for 30min, finally adding 6 parts of a mixture of cinnamaldehyde and hexamethylenetetramine (the ratio of cinnamaldehyde to hexamethylenetetramine is 1: 1) and 2 parts of sodium persulfate, and continuously stirring for 15min to obtain a finished product of the deep-penetration chelating environment-friendly online unblocking system.
The deep penetration chelating environment-friendly online deblocking system is prepared into a 15% solution to test the corrosion performance of the solution, the corrosion rate of the system is found to be equivalent to that of a conventional hydrochloric acid system, the reaction rate of the system with acid rock is further tested, the average reaction rate of the deep penetration chelating environment-friendly online deblocking system at 70 ℃ is 0.093g/min, the reaction rate of the hydrochloric acid system at 70 ℃ is 1.07g/min, and the retarding effect is obvious. The capacity of deep penetration chelating environment-friendly on-line blockage removing system for chelating metal ions is measured by gradually dripping iron ion standard solution into the residual liquid, each milliliter of residual acid can chelate 8.2mg of iron ions, 4.8mg of magnesium ions, 5.5mg of calcium ions, 5.3mg of barium ions and 4.4mg of strontium ions, and the metal ions can be effectively prevented from forming precipitates in the residual acid, so that secondary damage is avoided.
After the XX well of the XX oil field oil production plant carries out sand consolidation operation in 8 months of 2015, the liquid production and the oil production are respectively reduced to 13m3/d and 2.6m3/d from 35m3/d and 7.7m3/d before the operation. Thereafter, as production proceeds, clogging becomes more severe. The well is subjected to the process blockage removal operation in 2018, 7 months, the liquid production amount is increased to 32m3/d after blockage removal, and the oil production amount is increased to 9.4m 3/d.
The product protected by the scheme is put into practical production and application at present, and obviously proves that the technical scheme of the product is beneficial, meets social requirements, and is suitable for batch production and popularization and use.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A deeply-penetrated chelating environment-friendly online blockage removing system is characterized in that: comprises the following components by weight: 2 to 5 percent of matrix chain scission agent, 10 to 30 percent of solid chelating acid, 5 to 20 percent of clay stabilizer, 10 to 20 percent of synergist, 3 to 10 percent of corrosion inhibitor and the balance of water.
2. The deep penetration chelating environment-friendly online blockage relieving system according to claim 1, characterized in that: the matrix chain scission agent is one or two polymers of sodium persulfate, potassium persulfate and ammonium persulfate.
3. The deep penetration chelating environment-friendly online blockage relieving system according to claim 1, characterized in that: the solid chelating acid is selected from one or more of ethylenediamine tetraacetic acid, citric acid, hydroxyethyl ethylenediamine triacetic acid, amino trimethylene phosphonic acid, ethylenediamine tetramethylene phosphonic acid, glycolic acid and amino triacetic acid.
4. The deep penetration chelating environment-friendly online blockage relieving system according to claim 1, characterized in that: the clay stabilizer is selected from one or more of potassium chloride, ammonium chloride, polyquaternary ammonium salt and quaternary ammonium salt.
5. The deep penetration chelating environment-friendly online blockage relieving system according to claim 4, characterized in that: the polyquaternary ammonium salt is selected from one or a mixture of two of poly dimethyl diallyl ammonium chloride and poly allyl trimethyl ammonium chloride.
6. The deep penetration chelating environment-friendly online blockage relieving system according to claim 4 or 5, characterized in that: the quaternary ammonium salt is selected from one or more of tetramethylammonium chloride, allyltrimethylammonium chloride, dodecyltrimethylammonium chloride and dodecyldimethylbenzylammonium chloride.
7. The deep penetration chelating environment-friendly online blockage relieving system according to claim 1, characterized in that: the synergist is one or more selected from ammonium citrate, sodium gluconate, sodium tartrate and dihydroxyethyl glycine.
8. The deep penetration chelating environment-friendly online blockage relieving system according to claim 1, characterized in that: the corrosion inhibitor is prepared by compounding cinnamaldehyde and hexamethylenetetramine according to the mass ratio of 1: 2-4.
9. A preparation method of a deep penetration chelating environment-friendly on-line blockage relieving system is characterized by comprising the following steps: the method comprises the following steps: (1) sequentially adding water and solid chelating acid into the reaction kettle at room temperature under stirring, and stirring for 15-30 min;
(2) Adding the synergist and the clay stabilizer into the reaction kettle, and continuously stirring for 20-40 min;
(3) And finally, adding a certain proportion of corrosion inhibitor into the reaction kettle, and stirring for 10-20min to obtain the deep penetration chelating environment-friendly online unblocking system.
10. The preparation method of the deep penetration chelating environment-friendly online blockage relieving system according to claim 9, which is characterized by comprising the following steps of: the stirring time in the step (1) is 20 min; the stirring time in the step (2) is 320 min;
The stirring time in the step (3) is 15 min.
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| CN113061424A (en) * | 2021-03-03 | 2021-07-02 | 中国石油化工股份有限公司 | Solid blockage removal system for low-permeability oil reservoir oil-water well and preparation method thereof |
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