CN112745820A - Barium sulfate scale dissolving agent - Google Patents
Barium sulfate scale dissolving agent Download PDFInfo
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- CN112745820A CN112745820A CN202110137541.9A CN202110137541A CN112745820A CN 112745820 A CN112745820 A CN 112745820A CN 202110137541 A CN202110137541 A CN 202110137541A CN 112745820 A CN112745820 A CN 112745820A
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
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Abstract
The invention provides a barium sulfate scale dissolver, which consists of the following components: chelating agent, ethylenediamine tetraacetic acid, diethyl triamine pentaacetic acid, diethylene triamine penta methylene phosphonic acid, the content is 8% -12%; solubilizer: 6-12% of sodium formate and sodium hydroxide; the synergist comprises oxalic acid, salicylic acid, cinnamic acid and citric acid, and the content of the synergist is 0.4-1%; dispersing agent: 8-14% of polyvinyl acid and polymethacrylic acid; corrosion inhibitor: 0.8-1.0% of hydroxyethylidene phosphonic acid; surfactant (b): 3-5% of alkylbenzene sulfonate, monoethanolamine and diethanolamine; a demulsifier: sodium nonylphenol polyoxyethylene sulfate, the content is 0.6-1.2%; a cleanup additive: 1-2.4% of perfluorononenoxybenzene sodium sulfonate; clay stabilizer: 0.6-1.2% of epichlorohydrin-dimethylamine polycondensate. The method is suitable for dissolving the solid-phase blockage of the barite in the natural fracture, the scale dissolving rate is up to 97.19%, the reservoir damage can be removed, and the productivity of the oil-gas well can be recovered.
Description
Technical Field
The invention relates to an auxiliary agent used for oil and gas field development, in particular to a barium sulfate scale dissolver.
Background
Along with the increase of oil exploration and development difficulty, the number of deep high-temperature and high-pressure oil and gas wells is gradually increased, and in order to balance formation pressure and prevent underground accidents, high-density barite is mostly adopted in oil fields for weighting. For example, Tarim oil fields utilize large amounts of barite (BaSO) during drilling due to high formation pressure coefficients4) The method is characterized in that the weight is increased, the leakage of drilling and completion fluid of a target stratum is serious due to the development of reservoir fractures, the drilling and completion fluid invades natural fractures, a liquid phase part permeates into a stratum pore matrix, a solid phase part (weight materials such as barite) remains in the fractures, and after long-time aging, solid phase blockage such as barite is caused, and as a result, the yield of an oil-gas well is low or no output is caused. Therefore, the scale dissolver capable of effectively dissolving barium sulfate in reservoir fractures is urgently needed to be developed so as to solve the problem of low yield of oil and gas fields. The existing barium sulfate scale dissolvers, such as DT scale dissolver, SF-21 scale dissolver, SF-V4 scale dissolver, WL-740 scale dissolver and the like, are all directed at a small amount of barium sulfate scale formed in a shaft and pipeline area after water injection of an oil and gas field. Although the active polymer with the publication number of CN111548282A has high scale dissolution rate, the method adopts a multi-step synthesis process, has strict requirements on synthesis conditions, and cannot be popularized and applied on site. In patent CN104194755B, the basic components comprise ferrous sulfate, potassium dichromate and urotropine, the treatment cost of the residual liquid is high, the method is not environment-friendly, and the comprehensive benefit is low. In journal of natural gas exploration and development, volume 3, volume 39 in 2016 of "barite deep pollution removal technology" and journal of drilling fluid and completion fluid, volume 3, volume 30 in 2013 of "application of barite blockage removal technology in scientific exploration of well reservoir transformation", barium sulfate scale dissolver adopts single chelating agent as main agent, and both of them have the characteristics of high cost and low utilization rate.
Disclosure of Invention
The invention aims to solve the problem of solid-phase blockage of barite in reservoir fractures, and develops a barium sulfate scale dissolver which mainly comprises the following components: chelating agent, solubilizer, dispersant, corrosion inhibitor, surfactant, demulsifier, cleanup additive and clay stabilizer. The scale dissolver developed by the invention has high scale dissolving rate, can dissolve barite solid-phase blockage in natural cracks, removes reservoir damage and recovers the productivity of oil and gas wells.
The technical scheme adopted by the invention is as follows: the barium sulfate scale dissolver is prepared according to the formula proportion by mass percent. The main components and the contents thereof in the patent are as follows:
(1) chelating agent, ethylenediamine tetraacetic acid (EDTA), diethyltriamine pentaacetic acid (DTPA) and diethylenetriamine pentamethylene phosphonic acid (DTPMPA), with the content of 8% -12%.
(2) Solubilizer: 6-12% of sodium formate and sodium hydroxide.
(3) The synergist comprises oxalic acid, salicylic acid, cinnamic acid and citric acid, and the content of the synergist is 0.4-1%
(4) Dispersing agent: the content of the polyvinyl acid (PAA) and the polymethacrylic acid (PMA) is 8-14%
(5) Corrosion inhibitor: 0.8 to 1.0 percent of hydroxyethylidene phosphonic acid (HEDP)
(6) Surfactant (b): 3-5% of alkylbenzene sulfonate (ABS), monoethanolamine (ST) and diethanolamine (SA)
(7) A demulsifier: sodium nonylphenol polyoxyethylene sulfate (AES) with a content of 0.6 to 1.2%
(8) A cleanup additive: sodium perfluorononenoxybenzenesulfonate (OBS) with a content of 1-2.4%
(9) Clay stabilizer: 0.6 to 1.2 percent of condensation polymer of epoxy chloropropane and dimethylamine
(10) Water: balance of
The chelating agent in the step (1) is compounded by ethylenediamine tetraacetic acid, diethyltriamine pentaacetic acid and diethylenetriamine penta (methylene phosphonic acid), and the mass ratio is preferably 3: 2: 0.5 to 1.
The solubilizer in the step (2) is prepared by compounding sodium formate and sodium hydroxide, and the mass ratio is preferably 7-9: 1 to 3.
The synergist in the step (3) is compounded by oxalic acid, salicylic acid, cinnamic acid and citric acid, and the mass ratio is preferably 3: 1: 4: 2.
the dispersing agent in the step (4) is compounded by polyethylene acid and polymethacrylic acid, and the mass ratio is preferably 3-5: 4.
the surfactant in the step (6) is compounded by alkylbenzene sulfonate, monoethanolamine and diethanolamine, and the mass ratio is preferably 1: 0.5-1: 1 to 3.
Detailed Description
The invention will be further elucidated with reference to the following examples, which do not limit the scope of the invention.
Example 1:
preparing 100mL of scale dissolver, and taking the components according to the following proportion
Chelating agent including EDTA 6%, DTPA 4% and DTPMPA 2%.
Solubilizer: 7% of sodium formate and 3% of sodium hydroxide.
Synergist including oxalic acid 0.3%, salicylic acid 0.1%, cinnamic acid 0.4%, and citric acid 0.2%
Dispersing agent: polyvinyl acid (PAA) 4% and polymethacrylic acid (PMA) 8%
Corrosion inhibitor: hydroxyethylidene phosphonic acid (HEDP) 1.0%
Surfactant (b): 1% of alkylbenzene sulfonate (ABS), 1% of monoethanolamine (ST) and 3% of diethanolamine (SA)
A demulsifier: sodium nonylphenol polyoxyethylene sulfate (AES) 1%
A cleanup additive: sodium perfluorononenoxybenzenesulfonate (OBS) 2%
Clay stabilizer: epichlorohydrin-dimethylamine polycondensate 1%
Water: 55 percent of
The components are mixed and fully stirred at room temperature to obtain 100mL of the barium sulfate scale dissolver.
Adding 1g of barium sulfate into a conical flask filled with 100mL of scale dissolver, shaking uniformly, sealing, placing into a water bath kettle at 80 ℃, and heating for 24h, wherein the scale dissolving rate of the scale dissolver is 97.19 percent.
Example 2:
preparing 100mL of scale dissolver, and taking the components according to the following proportion
Chelating agent including EDTA 6%, DTPA 3% and DTPMPA 3%.
Solubilizer: 6% of sodium formate and 4% of sodium hydroxide.
Synergist including oxalic acid 0.3%, salicylic acid 0.1%, cinnamic acid 0.4%, and citric acid 0.2%
Dispersing agent: polyvinyl acid (PAA) 4% and polymethacrylic acid (PMA) 6%
Corrosion inhibitor: 0.8% of hydroxyethylidene phosphonic acid (HEDP)
Surfactant (b): 1% of alkylbenzene sulfonate (ABS), 1% of monoethanolamine (ST) and 3% of diethanolamine (SA)
A demulsifier: sodium nonylphenol polyoxyethylene sulfate (AES) 1.2%
A cleanup additive: sodium perfluorononenoxybenzenesulfonate (OBS) 2%
Clay stabilizer: epichlorohydrin-dimethylamine polycondensate 0.6%
Water: 57.4 percent
The components are mixed and fully stirred at room temperature to obtain 100mL of the barium sulfate scale dissolver.
Adding 1g of barium sulfate into a conical flask filled with 100mL of scale dissolver, shaking uniformly, sealing, placing into a water bath kettle at 80 ℃, and heating for 24h, wherein the scale dissolving rate of the scale dissolver is 95.05 percent.
Example 3:
preparing 100mL of scale dissolver, and taking the components according to the following proportion
Chelating agent including EDTA 6%, DTPA 4% and DTPMPA 2%.
Solubilizer: 5% of sodium formate and 5% of sodium hydroxide.
Synergist including oxalic acid 0.3%, salicylic acid 0.1%, cinnamic acid 0.4%, and citric acid 0.2%
Dispersing agent: polyvinyl acid (PAA) 4% and polymethacrylic acid (PMA) 4%
Corrosion inhibitor: hydroxyethylidene phosphonic acid (HEDP) 1.0%
Surfactant (b): 1% of alkylbenzene sulfonate (ABS), 2% of monoethanolamine (ST) and 2% of diethanolamine (SA)
A demulsifier: sodium nonylphenol polyoxyethylene sulfate (AES) 0.6%
A cleanup additive: sodium perfluorononenoxybenzenesulfonate (OBS) 1.8%
Clay stabilizer: epichlorohydrin-dimethylamine polycondensate 0.6%
Water: 60 percent of
The components are mixed and fully stirred at room temperature to obtain 100mL of the barium sulfate scale dissolver.
Adding 1g of barium sulfate into a conical flask filled with 100mL of scale dissolver, shaking uniformly, sealing, placing into a water bath kettle at 80 ℃, and heating for 24h, wherein the scale dissolving rate of the scale dissolver is 96.78 percent.
Claims (6)
1. The barium sulfate scale dissolver is characterized by comprising the following raw materials in percentage by mass:
(1) chelating agent including EDTA, DTPA and DTPMPA, in 8-12 wt%
(2) Solubilizer: sodium formate and sodium hydroxide, the content is 6-12%
(3) The synergist comprises oxalic acid, salicylic acid, cinnamic acid and citric acid, and the content of the synergist is 0.4-1%
(4) Dispersing agent: polyvinyl acid (PAA) and polymethacrylic acid (PMA) with the content of 8-14 percent
(5) Corrosion inhibitor: 0.8 to 1.0 percent of hydroxyethylidene phosphonic acid (HEDP)
(6) Surfactant (b): 3-5% of alkylbenzene sulfonate (ABS), monoethanolamine (ST) and diethanolamine (SA)
(7) A demulsifier: sodium nonylphenol polyoxyethylene sulfate (AES) with a content of 0.6 to 1.2%
(8) A cleanup additive: sodium perfluorononenoxybenzenesulfonate (OBS) with a content of 1-2.4%
(9) Clay stabilizer: 0.6 to 1.2 percent of condensation polymer of epoxy chloropropane and dimethylamine
(10) Water: and (4) the balance.
2. The barium sulfate scale dissolver according to claim 1, wherein: the chelating agent is compounded by ethylenediamine tetraacetic acid, diethyltriamine pentaacetic acid and diethylenetriamine penta (methylene phosphonic acid), and the mass ratio is preferably 3: 2: 0.5 to 1.
3. The barium sulfate scale dissolver according to claim 1, wherein: the solubilizer is prepared by compounding sodium formate and sodium hydroxide, and the mass ratio is preferably 7-9: 1 to 3.
4. The barium sulfate scale dissolver according to claim 1, wherein: the synergist is compounded by oxalic acid, salicylic acid, cinnamic acid and citric acid, and the mass ratio is preferably 3: 1: 4: 2.
5. the barium sulfate scale dissolver according to claim 1, wherein: the dispersing agent is compounded by polyethylene acid and polymethacrylic acid, and the mass ratio is preferably 3-5: 4.
6. the barium sulfate scale dissolver according to claim 1, wherein: the surfactant is compounded by alkylbenzene sulfonate, monoethanolamine and diethanolamine, and the mass ratio is preferably 1: 0.5-1: 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110137541.9A CN112745820A (en) | 2021-02-01 | 2021-02-01 | Barium sulfate scale dissolving agent |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110137541.9A CN112745820A (en) | 2021-02-01 | 2021-02-01 | Barium sulfate scale dissolving agent |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111286313A (en) * | 2020-03-05 | 2020-06-16 | 长江大学 | Barium-strontium sulfate scale biological descaling liquid and descaling method thereof |
| CN113025295A (en) * | 2021-05-26 | 2021-06-25 | 陕西万普隆油气技术服务有限公司 | Low-temperature blocking remover for oil and gas wells, preparation method and application |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111286313A (en) * | 2020-03-05 | 2020-06-16 | 长江大学 | Barium-strontium sulfate scale biological descaling liquid and descaling method thereof |
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| CN113025295A (en) * | 2021-05-26 | 2021-06-25 | 陕西万普隆油气技术服务有限公司 | Low-temperature blocking remover for oil and gas wells, preparation method and application |
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Application publication date: 20210504 |