Recoverable barite blocking remover, recovery method and application

Abstract

The invention provides a recoverable barite blocking remover, a recovery method and application. Relates to the field of petroleum drilling shaft reservoir protection. Comprising the following raw materials in parts by weight: 4-25.5 parts of a chelating agent, 2-10 parts of a dissolution promoter, 1-5 parts of a surfactant, 5-15 parts of a scale inhibitor, 1-10 parts of alkali and 35-86 parts of water, the chelating agent comprises one or more of 1, 2-cyclohexanediamine tetraacetic acid, ethylenediamine tetraacetic acid or diethylene pentaacetic acid; the scale inhibitor comprises polyaspartic acid and / or polyepoxysuccinic acid; the surfactant comprises alkyl polyglucoside. The recoverable barite blocking remover provided by the invention not only has high corrosion amount, but also can be efficiently recovered, the corrosion amount is 1.96-1.98 g / 100ml, and the highest recovery rate can reach 95-98%.

Description

Technical Field

[0001] The invention relates to the field of oil drilling wellbore reservoir protection, and in particular to a recoverable barite plugging remover, a recovery method and an application thereof. Background Art

[0002] In the process of oil and gas field mining, barite (BaSO 4 ) is a common drilling fluid weighting material. Due to its excellent chemical stability and high density, barite is widely used in drilling operations. However, during the production and water injection process of oil and gas wells, barite deposition will block the reservoir pores, resulting in reduced permeability, which seriously affects the production efficiency of oil and gas wells. Therefore, the research and application of barite plugging removers has gradually become an important topic in the oil extraction industry.

[0003] Existing barite plugging removers mainly include acidic solutions, complexing agents and some new chemical agents. These plugging removers dissolve or disperse barite through chemical reactions to restore the permeability of the reservoir. However, most of the plugging removers cannot be recovered after use, which can easily cause secondary pollution to the reservoir and the surrounding environment. In addition, the effect of the plugging remover is also restricted by the formation conditions (such as temperature, pressure, mineral composition, etc.).

[0004] With the increasingly stringent environmental regulations and the increase in oil production costs, the research and development of recyclable barite plugging removers is particularly important. On the one hand, recycling plugging removers can reduce the use of chemical agents and reduce environmental pollution, which is in line with the concept of green mining; on the other hand, recycling can also reduce production costs and improve economic benefits. In addition, recyclable plugging removers can also avoid chemical damage to the formation caused by repeated injections and maintain the long-term stability of the reservoir.

[0005] In practical applications, non-recyclable plugging removers are usually discharged to the surface or into the deep reservoir along with the fluid after use, which not only makes it difficult to control the residual agent, but also may cause formation damage or water pollution. Therefore, the development of an efficient and recyclable barite plugging remover can not only effectively remove blockages, but also reduce environmental risks, which is of great practical significance.

[0006] There are some barite plugging removers on the market that claim to be recyclable, but these products still have many problems. Low recovery rate is a major bottleneck. Due to the complex diffusion and reaction process of the plugging remover in the reservoir, some agents are difficult to completely recover, resulting in unsatisfactory results. Secondly, the chemical properties of existing recyclable plugging removers are relatively simple, the dissolution rate is insufficient, and the adaptability under complex geological conditions is insufficient, and they often cannot meet the needs of different reservoirs. In addition, the recovery process of the plugging remover is complex, costly, and difficult to operate, which limits its large-scale application in actual production.

[0007] In general, the existing recyclable barite plugging removers still have significant deficiencies in recovery efficiency, dissolution rate, ease of operation and cost-effectiveness, and are in urgent need of further improvement and optimization. Summary of the invention

[0008] In view of the technical problems existing in the prior art, the present invention aims to provide a recyclable barite plugging remover, a recovery method and an application thereof.

[0009] One of the purposes of the present invention is to provide a recyclable barite plugging remover, wherein the recyclable barite plugging remover comprises the following raw materials in parts by weight:

[0010]

[0011] The chelating agent includes one or more of 1,2-cyclohexanediaminetetraacetic acid, ethylenediaminetetraacetic acid or diethylenepentaacetic acid; the scale inhibitor includes polyaspartic acid and / or polyepoxysuccinic acid; and the surfactant includes alkyl polyglucoside.

[0012] Preferably, the chelating agent comprises a combination of 1,2-cyclohexanediaminetetraacetic acid, ethylenediaminetetraacetic acid and diethylenepentaacetic acid.

[0013] Preferably, the mass ratio of diethylenepentaacetic acid, ethylenediaminetetraacetic acid and 1,2-cyclohexanediaminetetraacetic acid is (4-6):(1-3):(0.5-1.5).

[0014] Preferably, the solubilizing agent comprises KCl, K 2 CO 3 , CHKO 2 One or more of; the base includes KOH.

[0015] Preferably, the preparation method of the recyclable barite plugging remover comprises: firstly adding a chelating agent, a dissolution promoter, a surfactant and a scale inhibitor to water in proportion under stirring, then adding an alkali in proportion, stirring for 20 to 40 minutes, to obtain a recyclable barite plugging remover.

[0016] The second object of the present invention is to provide a method for recovering a recyclable barite plugging remover, the method comprising:

[0017] S1: Add HCl and cation exchange resin to the unblocking agent after unblocking under stirring to reduce the pH to 10-11, and then add 1-3% of the weight of the unblocking system. 2 SO 4 , stirring speed is 200~500rpm;

[0018] S2 When the pH of the plugging removal system drops to 6-9, add 2-10% of the weight of the plugging removal system under stirring. 2 SO 4and Na 2 SO 4 The stirring speed is 200-500 rpm;

[0019] S3 is allowed to stand for 2 to 6 hours and subjected to plate and frame filtration to obtain clear liquid and barite, thereby completing recovery.

[0020] Preferably, in step S2, when the pH of the plugging removal system is reduced to 6.0-7.5, 2-10% of the weight of the plugging removal system is added under stirring. 2 SO 4 and Na 2 SO 4 combination.

[0021] Preferably, in step S1, HCl, H 2 SO 4 The mass ratio of cationic exchange resin is (6-8):(1-3):1.

[0022] Preferably, in step S2, H 2 SO 4 with Na 2 SO 4 The mass ratio is 2:3.

[0023] Preferably, the recovery method further comprises adding 2% to 5% by weight of a scale inhibitor and 1% to 3% by weight of a surfactant to the clear liquid obtained in step S3.

[0024] The third object of the present invention is to provide a recyclable barite plugging remover for use in oil and natural gas production.

[0025] Beneficial effects of the present invention:

[0026] The present invention provides a recyclable barite plugging remover, comprising the following raw materials in parts by weight: 5 to 25.5 parts of a chelating agent, 2 to 10 parts of a dissolution promoter, 1 to 5 parts of a surfactant, 5 to 15 parts of a scale inhibitor, 1 to 10 parts of an alkali, and 35 to 86 parts of water. The chelating agent comprises one or more of 1,2-cyclohexanediaminetetraacetic acid, ethylenediaminetetraacetic acid or diethylenepentaacetic acid; the scale inhibitor comprises polyaspartic acid and / or polyepoxysuccinic acid; and the surfactant comprises alkyl polyglucoside.

[0027] The chelating agents 1,2-cyclohexanediaminetetraacetic acid, ethylenediaminetetraacetic acid or diethylenepentaacetic acid, the antiscalants aspartic acid and polyepoxysuccinic acid all contain multiple carboxyl and amine coordination groups. In the process of unblocking, they can form stable complexes with metal ions in the blockage, making the metal ions lose the ability to combine with other substances to form blockages. Due to the presence of carboxyl groups in the chelating agent, when recycling, under acidic conditions, after adding SO 4 2-When the chelated Ba 2+ Can be released from the complex and react to form BaSO 4 The barite is separated from the plugging removal liquid system by precipitation, and the chelating agent and scale inhibitor can be restored to the carboxylic acid state.

[0028] Surfactant alkyl polyglucoside belongs to polyhydroxy compounds, and its solution has low surface tension. First, it can remove dirt from barite attached with oil stains, exposing the surface of barite and making it easier to dissolve. Second, the alkyl polyglucoside solution itself is alkaline, which is conducive to the dissolution of chelating agents and the reduction of alkali addition. Alkyl polyglucoside is resistant to hard water, contains only carbon, oxygen and hydrogen elements, is biodegradable, and is pollution-free when used in formations. Alkyl polyglucoside can stably exist in strong acid and strong alkaline environments without being affected. Therefore, during the chelation and regeneration process, the structure does not change, and it can still play a role in recycling.

[0029] By using a potassium ion-containing solvent and alkali, the chelating agent will be deprotonated and form salts with potassium ions during the plugging removal process, which can greatly increase the number and active sites of the chelating agent in the plugging remover, thereby more effectively removing barite deposition; on the other hand, in plugging removal applications, potassium ions can be used as a clay stabilizer to prevent clay expansion and secondary damage to the formation. Only a small amount of the solvent and alkali are consumed in the chelating plugging removal process, and the recovered plugging remover can still be used.

[0030] The recyclable barite plugging remover provided by the present invention not only has a high dissolution amount, but also can be efficiently recovered. The dissolution amount is 1.96-1.98 g / 100 ml, and the recovery rate can reach up to 95%-98%. DETAILED DESCRIPTION

[0031] According to the first aspect of the present invention, a recyclable barite plugging remover is provided, wherein the recyclable barite plugging remover comprises the following raw materials in parts by weight.

[0032]

[0033] The chelating agent includes one or more of 1,2-cyclohexanediaminetetraacetic acid, ethylenediaminetetraacetic acid or diethylenepentaacetic acid;

[0034] The scale inhibitor includes polyaspartic acid and / or polyepoxysuccinic acid;

[0035] Surfactants include alkyl polyglucosides.

[0036] In the present invention, the chelating agent removes or inhibits these metal ions by forming stable chelates with the metal ions, preventing them from reacting adversely with other chemical components, thereby helping to dissolve and remove the blockage. The weight of the chelating agent is, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts or 25.5 parts.

[0037] In the present invention, the chelating agent is, for example, 1,2-cyclohexanediaminetetraacetic acid, ethylenediaminetetraacetic acid, diethylenepentaacetic acid, 1,2-cyclohexanediaminetetraacetic acid and ethylenediaminetetraacetic acid, ethylenediaminetetraacetic acid and diethylenepentaacetic acid, 1,2-cyclohexanediaminetetraacetic acid and diethylenepentaacetic acid, or a combination of 1,2-cyclohexanediaminetetraacetic acid, ethylenediaminetetraacetic acid and diethylenepentaacetic acid.

[0038] The chelating agent forms a chelate in an alkaline environment. When a strong acid is added during recovery, the pH of the deblocking system gradually decreases, which weakens the chelating effect and introduces additional SO 4 2- , under the dual effect, the chelated Ba 2+ , and then precipitation reaction occurs in a weakly acidic environment to generate BaSO 4 At the same time, the chelating agent returns to the carboxylic acid state and can be recovered.

[0039] In a preferred embodiment of the present invention, the chelating agent comprises a combination of 1,2-cyclohexanediaminetetraacetic acid, ethylenediaminetetraacetic acid and diethylenepentaacetic acid.

[0040] In a preferred embodiment of the present invention, the mass ratio of diethylenepentaacetic acid, ethylenediaminetetraacetic acid and 1,2-cyclohexanediaminetetraacetic acid is (4-6):(1-3):(0.5-1.5).

[0041] In the present invention, the weight ratio of diethylenepentaacetic acid, ethylenediaminetetraacetic acid and 1,2-cyclohexanediaminetetraacetic acid is, for example, 4:1:0.5, 4:1:1, 4:1:1.5, 5:1:0.5, 5:1:1, 5:1:1.5, 6:1:0.5, 6:1:1, 6:1:1.5, 4:2:0.5, 4:2:1, 4:2:1.5, 5:2:0.5, 5:2:1, 5:2:1.5, 6:2:0.5, 6:2:1, 6:2:1.5, 4:3:0.5, 4:3:1, 4:3:1.5, 5:3:0.5, 5:3:1, 5:3:1.5, 6:3:0.5, 6:3:1 or 6:3:1.5.

[0042] Preferably, the weight ratio of diethylenepentaacetic acid, ethylenediaminetetraacetic acid and 1,2-cyclohexanediaminetetraacetic acid is 5:2:1.

[0043] In the present invention, the dissolving agent improves the dissolving ability of the blockage remover on the blockage, promotes the dissolution and removal of the blockage, and the weight of the dissolving agent is, for example, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts.

[0044] In a preferred embodiment of the present invention, the solubilizing agent comprises KCl, K 2 CO 3 , CHKO 2 One or more of the following;

[0045] In the present invention, the solubilizing agent is, for example, KCl, K 2 CO 3 , CHKO 2 , KCl and K 2 CO 3 , K 2 CO 3 and CHKO 2 , KCl and CHKO 2 , or KCl, K 2 CO 3 and CHKO 2 combination.

[0046] In the present invention, the surfactant can expose the barite attached with oil stains, reduce the diffusion resistance of the chelating agent, and make it easier to contact with the surface of the barite to play a role in unblocking. The weight of the surfactant is, for example, 1 part, 2 parts, 3 parts, 4 parts or 5 parts.

[0047] In the present invention, the surfactant preferably uses alkyl polyglucoside. First, alkyl polyglucoside belongs to a polyhydroxy compound, and the surface tension of the solution is low. First, it can play a decontamination role on the barite attached with oil stains, so that the surface of the barite is exposed and more easily dissolved; secondly, the alkyl polyglucoside solution itself is alkaline, which is conducive to the dissolution of the chelating agent and the reduction of the amount of alkali. Alkyl polyglucoside has resistance to hard water, contains only carbon, oxygen and hydrogen elements, is biodegradable, and is pollution-free in formation applications. The surfactant alkyl polyglucoside can stably exist in strong acid and strong alkali environments without being affected. Therefore, in the process of chelation unblocking and regeneration, the structure does not change, and it can still play a role in recycling.

[0048] In the present invention, the scale inhibitor inhibits the growth and aggregation of crystals and prevents the formation of inorganic salt scale, thereby maintaining the patency and effectiveness of the plugging remover. It reduces the generation of precipitates by enhancing the control ability of the plugging remover on metal ions, and disperses tiny crystals or precipitates to prevent deposition. The weight of the scale inhibitor is, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts.

[0049] In the present invention, the scale inhibitor includes polyaspartic acid and / or polyepoxysuccinic acid. First, the two scale inhibitors belong to the carboxylic acid class and have carboxyl functional groups. 2+ It also has a chelating effect, which improves the dissolution capacity of the plugging removal system and stabilizes the Ca 2+ Other ions, as well as the scale inhibitor containing no phosphorus, are friendly to the formation environment and have good biodegradability. After the plugging is removed, the pH of the plugging removal system gradually decreases during the recovery process, and the same precipitation reaction occurs to obtain the carboxylic acid scale inhibitor again.

[0050] Preferably, the antiscalant comprises polyepoxysuccinic acid.

[0051] In the present invention, the base is used to adjust the pH of the reaction system, and the weight of the base is, for example, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts.

[0052] The selected chelating agent will be deprotonated during the unblocking process. In this system, a potassium ion-containing solvent and a base are preferably used. After deprotonation, the above-mentioned chelating agent forms salts with potassium ions, which can greatly increase the number and active sites of the chelating agent in the unblocking agent, thereby more effectively removing barite deposits. On the other hand, in the unblocking application, potassium ions can be used as clay stabilizers to prevent clay expansion and secondary damage to the formation.

[0053] In the present invention, the weight of water is, for example, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts or 86 parts.

[0054] According to a second aspect of the present invention, a method for recovering a recyclable barite plugging remover is provided, the method comprising:

[0055] S1: Add HCl and cation exchange resin to the unblocking agent after unblocking under stirring to reduce the pH to 10-11, and then add 1-3% of the weight of the unblocking system. 2 SO 4 , stirring speed is 200~500rpm;

[0056] S2 When the pH of the plugging removal system drops to 6-9, add 2-10% of the weight of the plugging removal system under stirring. 2 SO 4 and Na 2 SO 4 The stirring speed is 200-500 rpm;

[0057] S3 is allowed to stand for 2 to 6 hours and subjected to plate and frame filtration to obtain clear liquid and barite, thereby completing recovery.

[0058] In a preferred embodiment of the present invention, when the pH of the plugging removal system is reduced to 6.0-7.5 in step S2, H2O accounting for 2-10% of the weight of the plugging removal system is added under stirring. 2 SO 4 and Na 2 SO 4 combination.

[0059] In the present invention, in step S2, when the pH of the plugging removal system is, for example, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4 or 7.5, 2 to 10% of the weight of the plugging removal system is added under stirring. 2 SO 4 and Na 2 SO 4 combination.

[0060] In a preferred embodiment of the present invention, the HCl, H 2 SO 4 The mass ratio of cationic exchange resin is (6-8):(1-3):1.

[0061] In the present invention, HCl, H 2 SO 4 The mass ratio of cation exchange resin is, for example, 6:1:1, 6:2:1,

[0062] 6:3:1, 7:1:1, 7:2:1, 7:3:1, 8:1:1, 8:2:1 or 8:3:1.

[0063] In a preferred embodiment of the present invention, in step S2, H 2 SO 4 with Na 2 SO 4 The mass ratio is 2:3.

[0064] In a preferred embodiment of the present invention, the recovery method further comprises adding 2% to 5% by weight of a scale inhibitor and 1% to 3% by weight of a surfactant to the clear liquid obtained in step S3.

[0065] In the present invention, the weight of the scale inhibitor added is, for example, 2%, 3%, 4% or 5% of the weight of the clear liquid; the weight of the surfactant added is, for example, 1%, 2% or 3%.

[0066] According to a third aspect of the present invention, there is provided a use of a recoverable barite plugging remover in oil and natural gas production.

[0067] In the present invention, the method for using the recyclable barite plugging remover includes: first, when the formation and equipment pressure permit, the prepared plugging remover solution is squeezed into the near-wellbore area using a pump truck, the well is shut down for reaction for 4 to 8 hours, and the barite scale in the formation cracks is dissolved; then, under the action of the formation pressure, the plugging remover solution is returned to the wellbore, soaked for 4 to 24 hours, the barite scale on the wellbore and the wall is dissolved, and finally returned to the ground.

[0068] Example

[0069] The present invention provides 16 embodiments and 4 comparative examples. Table 1 shows the raw material ratios of embodiments 1 to 16 and comparative examples 1 to 4. Among them, 1,2-cyclohexanediaminetetraacetic acid is referred to as CDTA, ethylenediaminetetraacetic acid is referred to as EDTA, diethylenepentaacetic acid is referred to as DTPA, the surfactant is 3 parts of alkyl polyglucoside, referred to as APG; the scale inhibitor is polyepoxysuccinic acid, referred to as PESA, and the solvent is 6 parts of K 2 CO 3 , 5 parts of KOH are used as the alkali. In comparative example 2, the scale inhibitor is ethylenediaminetetramethylenephosphonic acid, referred to as EDTMPS, in comparative example 3, the surfactant is dodecyl dimethyl betaine, referred to as BS-12, and in comparative example 4, the chelating agent is tetrasodium iminodisuccinate, referred to as IDS.

[0070] The raw material proportions of Examples 1 to 16 and Comparative Examples 1 to 4 are shown in Table 1.

[0071] Table 1 Raw material ratios of Examples 1 to 16 and Comparative Examples 1 to 4

[0072]

[0073]

[0074] The preparation method is as follows: firstly, a chelating agent, a dissolution promoter, a surfactant and a scale inhibitor are added to water in proportion under stirring, then an alkali is added in proportion, and the mixture is stirred for 20 to 40 minutes to obtain a recyclable barite plugging remover.

[0075] Performance Testing

[0076] 1. Scaling rate

[0077] 100 mL of the unblocking agent solution was measured and placed in a 250 mL conical flask with a stopper, and then 2.0 g of barite scale was added. The flask was placed in a 25°C water bath environment, a 90°C water bath environment, and a 160°C oil bath environment, respectively. Each environment was timed for 4 h and 24 h, respectively, to dissolve the barite scale. After the dissolution was completed, the liquid in the conical flask was filtered, and the undissolved scale sample was dried to constant weight, and the scale dissolution rate was calculated.

[0078] Calculation formula for scaling rate:

[0079]

[0080] 2. Recovery rate

[0081] After the plugging is completed, add HCl and cation exchange resin to the unblocking agent under stirring to reduce the pH to 10-11, then add H 2 SO 4 , stirring speed was 350 rpm, HCl, H 2 SO 4 The mass ratio of cation exchange resin to cation exchange resin is 7:2:1. When the pH of the plugging removal system is reduced to 6.0-7.5, 6% of the weight of H2O2 in the plugging removal system is added under stirring. 2 SO 4 and Na 2 SO 4 The stirring speed was 350 rpm; the mixture was allowed to stand for 4 hours, and plate and frame filtration was performed to obtain a clear liquid and barite, and the recovery rate was calculated.

[0082] Recovery rate calculation formula:

[0083]

[0084] Table 2 Scaling rate test results of Examples 1 to 16 and Comparative Examples 1 to 4

[0085]

[0086] The sample of the unblocking agent in Example 4 after unblocking in a 25°C water bath environment for 24 hours was used for recovery determination. The experiment was divided into two groups. One group was added with H 2 SO 4 and Na 2 SO 4 Before the combination, the pH of the plugging removal system was reduced to 6.0-7.5, and the other group added H 2 SO 4 and Na 2 SO 4 Before the combination, the pH of the plugging removal system is reduced to 7.5-9.0.

[0087] Table 3 Recovery test results of Examples 1 to 16 and Comparative Examples 1 to 4

[0088]

[0089]

Claims

1. A recyclable barite plugging remover, characterized in that: The invention comprises the following raw materials in parts by weight: The chelating agent includes one or more of 1,2-cyclohexanediaminetetraacetic acid, ethylenediaminetetraacetic acid or diethylenepentaacetic acid; the scale inhibitor includes polyaspartic acid and / or polyepoxysuccinic acid; and the surfactant includes alkyl polyglucoside.

2. The recyclable barite plugging remover according to claim 1, characterized in that: The chelating agent includes a combination of 1,2-cyclohexanediaminetetraacetic acid, ethylenediaminetetraacetic acid, and diethylenepentaacetic acid.

3. The recyclable barite plugging remover according to claim 1, characterized in that: The mass ratio of the diethylene pentaacetic acid, ethylenediaminetetraacetic acid and 1,2-cyclohexanediaminetetraacetic acid is (4-6):(1-3):(0.5-1.5).

4. The recyclable barite plugging remover according to claim 1, characterized in that: The chaotropic agent includes one or more of KCl, K2CO3, and CHKO2; and the base includes KOH.

5. The recyclable barite plugging remover according to claim 1, characterized in that: The preparation method of the recyclable barite plugging remover comprises: firstly adding a chelating agent, a dissolution promoter, a surfactant and a scale inhibitor into water in proportion under stirring, then adding alkali in proportion, stirring for 20 to 40 minutes, and obtaining the recyclable barite plugging remover.

6. A method for recovering a recoverable barite plugging remover according to any one of claims 1 to 5, characterized in that: The recovery method comprises the following steps: S1. Add HCl and cation exchange resin to the unblocking agent after unblocking under stirring to reduce the pH to 10-11, and then add H2SO4 accounting for 1-3% of the weight of the unblocking system, and stir at a speed of 200-500 rpm; S2 When the pH of the plugging removal system is reduced to 6.0-9.0, a combination of H2SO4 and Na2SO4 accounting for 2-10% of the weight of the plugging removal system is added under stirring at a stirring speed of 200-500 rpm; S3 is allowed to stand for 2 to 6 hours and subjected to plate and frame filtration to obtain clear liquid and barite, thereby completing recovery.

7. The method for recovering the recyclable barite plugging remover according to claim 6, characterized in that: The mass ratio of HCl, H2SO4 and cation exchange resin in step S1 is (6-8):(1-3):

1.

8. The method for recovering a recyclable barite plugging remover according to claim 6, characterized in that: The mass ratio of H2SO4 to Na2SO4 in step S2 is 2:

3.

9. The method for recovering a recyclable barite plugging remover according to claim 6, characterized in that: The recovery method further comprises adding 2% to 5% by weight of a scale inhibitor and 1% to 3% by weight of a surfactant to the clear liquid obtained in step S3.

10. Use of the recoverable barite plugging remover according to any one of claims 1 to 5 in oil and natural gas exploitation.

Images