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Barium sulfate scale dissolving agent

A technology of scale dissolving agent and barium sulfate, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as barite solid phase blockage

Pending Publication Date: 2021-05-04
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical goal of the patent of this invention is to develop a barium sulfate scale dissolving agent in order to solve the problem of barite solid-phase blockage in reservoir fractures. The main components include: chelating agent, solubilizer, dispersant, corrosion inhibitor, surface Activators, demulsifiers, drainage aids and clay stabilizers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare 100mL scale dissolver, take each component according to the following ratio

[0023] Chelating agent: ethylenediaminetetraacetic acid (EDTA) 6%, diethyltriaminepentaacetic acid (DTPA) 4%, diethylenetriaminepentamethylenephosphonic acid (DTMPPA) 2%.

[0024] Solubilizer: 7% sodium formate, 3% sodium hydroxide.

[0025] Synergist: oxalic acid 0.3%, salicylic acid 0.1%, cinnamic acid 0.4%, citric acid 0.2%

[0026] Dispersant: polyvinyl acid (PAA) 4%, polymethacrylic acid (PMA) 8%

[0027] Corrosion inhibitor: Hydroxyethylidenephosphonic acid (HEDP) 1.0%

[0028] Surfactant: alkylbenzene sulfonate (ABS) 1%, monoethanolamine (ST) 1%, diethanolamine (SA) 3%

[0029] Demulsifier: nonylphenol polyoxyethylene sodium sulfate (AES) 1%

[0030] Drainage aid: sodium perfluorononenyloxybenzene sulfonate (OBS) 2%

[0031] Clay stabilizer: epichlorohydrin - dimethylamine polycondensate 1%

[0032] Water: 55%

[0033] Mix the above components and stir thoroughly at room ...

Embodiment 2

[0036] Prepare 100mL scale dissolver, take each component according to the following ratio

[0037] Chelating agent: ethylenediaminetetraacetic acid (EDTA) 6%, diethyltriaminepentaacetic acid (DTPA) 3%, diethylenetriaminepentamethylenephosphonic acid (DTMPPA) 3%.

[0038] Solubilizer: 6% sodium formate, 4% sodium hydroxide.

[0039] Synergist: oxalic acid 0.3%, salicylic acid 0.1%, cinnamic acid 0.4%, citric acid 0.2%

[0040] Dispersant: polyvinyl acid (PAA) 4%, polymethacrylic acid (PMA) 6%

[0041] Corrosion inhibitor: Hydroxyethylidenephosphonic acid (HEDP) 0.8%

[0042] Surfactant: alkylbenzene sulfonate (ABS) 1%, monoethanolamine (ST) 1%, diethanolamine (SA) 3%

[0043] Demulsifier: nonylphenol polyoxyethylene sodium sulfate (AES) 1.2%

[0044] Drainage aid: sodium perfluorononenyloxybenzene sulfonate (OBS) 2%

[0045] Clay stabilizer: epichlorohydrin-dimethylamine polycondensate 0.6%

[0046] Water: 57.4%

[0047] Mix the above components and stir thoroughly at r...

Embodiment 3

[0050] Prepare 100mL scale dissolver, take each component according to the following ratio

[0051] Chelating agent: ethylenediaminetetraacetic acid (EDTA) 6%, diethyltriaminepentaacetic acid (DTPA) 4%, diethylenetriaminepentamethylenephosphonic acid (DTMPPA) 2%.

[0052] Solubilizer: 5% sodium formate, 5% sodium hydroxide.

[0053] Synergist: oxalic acid 0.3%, salicylic acid 0.1%, cinnamic acid 0.4%, citric acid 0.2%

[0054] Dispersant: polyvinyl acid (PAA) 4%, polymethacrylic acid (PMA) 4%

[0055] Corrosion inhibitor: Hydroxyethylidenephosphonic acid (HEDP) 1.0%

[0056] Surfactant: alkylbenzenesulfonate (ABS) 1%, monoethanolamine (ST) 2%, diethanolamine (SA) 2%

[0057] Demulsifier: nonylphenol polyoxyethylene sodium sulfate (AES) 0.6%

[0058] Drainage aid: sodium perfluorononenyloxybenzene sulfonate (OBS) 1.8%

[0059] Clay stabilizer: epichlorohydrin-dimethylamine polycondensate 0.6%

[0060] Water: 60%

[0061] Mix the above components and stir thoroughly at ro...

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Abstract

The invention provides a barium sulfate scale dissolving agent which is composed of the following components: chelating agents: 8-12% of ethylenediamine tetraacetic acid, diethyl triamine pentaacetic acid and diethylene triamine penta (methylene phosphonic acid); solubilizers: sodium formate and sodium hydroxide with the content of 6-12%; the synergist comprises oxalic acid, salicylic acid, cinnamic acid and citric acid with the content of 0.4-1%; dispersing agents: polyethylene acid and polymethylacrylic acid with the content of 8-14%; corrosion inhibitor: hydroxyethylidene phosphonic acid with the content of 0.8-1.0%; surface active agent: alkylbenzene sulfonate, monoethanolamine and diethanolamine with the content of 3-5%; demulsifying agent: nonylphenol polyoxyethylene sodium sulfate with the content of 0.6-1.2%; a discharge aiding agent: perfluorononenyloxy sodium benzenesulfonate with the content of 1-2.4%; and clay stabilizer: epoxy chloropropane-dimethylamine condensation polymer with the content of 0.6-1.2%. The barium sulfate scale dissolving agent is suitable for dissolving barite solid-phase blockage in natural fractures, the scale dissolving rate reaches up to 97.19%, reservoir damage can be relieved, and the productivity of an oil and gas well can be recovered.

Description

technical field [0001] The invention relates to an auxiliary agent used in the development of oil and gas fields, in particular to a barium sulfate scale dissolving agent. Background technique [0002] With the increasing difficulty of oil exploration and development, the number of high-temperature and high-pressure oil and gas wells drilled in deep layers is gradually increasing. In order to balance the formation pressure and prevent downhole accidents, most oil fields use high-density barite as weight. For example, due to the high formation pressure coefficient in the Tarim Oilfield, a large amount of barite (BaSO 4 ) is aggravated, due to the development of reservoir fractures, the loss of drilling and completion fluid in the target layer is serious, the drilling and completion fluid invades natural fractures, the liquid phase part penetrates into the formation pore matrix, and the solid phase part (barite and other weighting materials) remains in the fractures , After a...

Claims

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Application Information

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IPC IPC(8): C09K8/528
CPCC09K8/528
Inventor 万里平谢萌潘家豪王柏辉胡成张小龙张力翟城
Owner SOUTHWEST PETROLEUM UNIV
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