Scale removing agent used in oil well and preparation method of scale removing agent

A technology for cleaning scales and oil wells, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of rubber layer aging of screw rods, internal pipeline pressure suppression, oil field production decline, etc., to extend the pump inspection period, Good removal effect, strong chelating effect

Active Publication Date: 2018-10-12
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Oilfield water injection is a common method to increase the production of low-permeability oilfields. When the injected water is incompatible with formation water, inorganic scales represented by carbonate and sulfate scales are easily formed in the deep formation to block the formation, resulting in a significant decline in oilfield production in the later stage. And long-term fouling will cause pressure on the internal pipeline, seriously affecting the normal production of the oil field
At present, acid descaling agent is often used for descaling, but the acid descaling agent has serious corrosion on metal equipment such as wellbore and gathering pipelines, and it has an aging effect on the rubber layer of the screw rod. Existence, the reaction of acid and sulfide produces hydrogen sulfide poisonous gas, which makes there are greater safety hazards in the production process

Method used

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  • Scale removing agent used in oil well and preparation method of scale removing agent
  • Scale removing agent used in oil well and preparation method of scale removing agent
  • Scale removing agent used in oil well and preparation method of scale removing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The descaling agent for oil wells is made of the following raw materials in parts by weight (unit: gram):

[0060] Tetrasodium iminodisuccinate solution 6 Diethylenetriaminepentaacetic acid solution 5

[0061] Sodium ethylenediamine tetramethylene phosphonate 3 Amino trimethylene phosphate 15

[0062] Polymaleic acid 12 Oxalic acid solution 5

[0063] Potassium hydroxide solution 26

[0064] The preparation method of this oil well descaling agent is:

[0065] Dissolve solid oxalic acid in distilled water, stir well and prepare 1g / L oxalic acid solution for later use;

[0066] Get solid potassium hydroxide and join in distilled water and constantly stir, obtain the potassium hydroxide solution that mass fraction is 10%, standby;

[0067] Dissolve diethylenetriaminepentaacetic acid crystals in distilled water, place them in a water bath at 55°C for water bath insulation, and stir at a speed of 1000r / min to obtain the desired concentration of 0.05mol / L after fully dissol...

Embodiment 2

[0071] The descaling agent for oil wells is made of the following raw materials in parts by weight (unit: gram):

[0072] Tetrasodium iminodisuccinate solution 6 Diethylenetriaminepentaacetic acid solution 8

[0073] Sodium ethylenediamine tetramethylene phosphonate 4 Amino trimethylene phosphate 10

[0074] Polymaleic acid 9 Oxalic acid solution 8

[0075] Potassium hydroxide solution 22

[0076] The preparation method of this oil well descaling agent is:

[0077] Dissolve solid oxalic acid in distilled water, stir well and prepare 1g / L oxalic acid solution for later use;

[0078] Get solid potassium hydroxide and join in distilled water and constantly stir, obtain the potassium hydroxide solution that mass fraction is 10%, standby;

[0079] Dissolve diethylenetriaminepentaacetic acid crystals in distilled water, place them in a water bath at 55°C for water bath insulation, and stir at a speed of 1000r / min to obtain the desired concentration of 0.05mol / L after fully disso...

Embodiment 3

[0083] The descaling agent for oil wells is made of the following raw materials in parts by weight (unit: gram):

[0084] Tetrasodium iminodisuccinate solution 6 Diethylenetriaminepentaacetic acid solution 6

[0085] Sodium ethylenediamine tetramethylene phosphonate 3.5 Amino trimethylene phosphate 13

[0086] Polymaleic acid 11 Oxalic acid solution 6

[0087] Potassium hydroxide solution 24

[0088] The preparation method of this oil well descaling agent is:

[0089] Dissolve solid oxalic acid in distilled water, stir well and prepare 1g / L oxalic acid solution for later use;

[0090] Get solid potassium hydroxide and join in distilled water and constantly stir, obtain the potassium hydroxide solution that mass fraction is 10%, standby;

[0091] Dissolve diethylenetriaminepentaacetic acid crystals in distilled water, place them in a water bath at 55°C for water bath insulation, and stir at a speed of 1000r / min to obtain the desired concentration of 0.05mol / L after fully di...

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Abstract

The invention relates to a scale removing agent used in an oil well and a preparation method of the scale removing agent, and belongs to the technical field of cleaning agents of petroleum exploitation equipment. The method provided by the invention adopts three-dimensional envelope type chelating agent tetrasodium iminodisuccinate (IDS), diethylene triamine pentaacetic acid (DTPA), amino trimethylene phosphonic acid (ATMP), sodium ethylenediamine tetramethylene phosphonate and polymaleic acid to prepare the alkaline scale removing agent, and the scale removing agent has strong chelating ability, complexes inorganic scale generated in an oil field through multi-stage ionization, has a better removing effect on the inorganic scale such as carbonate scale and sulfate scale and less corrosivity to the petroleum exploitation equipment, and prolongs a pump inspection cycle in the oil well.

Description

technical field [0001] The invention relates to a descaling agent for oil wells and a preparation method thereof, which belongs to the technical field of cleaning agents for oil exploitation equipment. Background technique [0002] Oilfield water injection is a common method to increase the production of low-permeability oilfields. When the injected water is not compatible with formation water, inorganic scales represented by carbonate and sulfate scales are easily formed in the deep formation to block the formation, resulting in a significant decline in oilfield production in the later stage. And long-term fouling will cause pressure on the internal pipeline, seriously affecting the normal production of the oil field. At present, acid descaling agent is often used for descaling, but the acid descaling agent has serious corrosion on metal equipment such as wellbore and gathering pipelines, and it has an aging effect on the rubber layer of the screw rod. Existence, the react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
CPCC09K8/528
Inventor 王松朱著胡三清李行王浩任
Owner YANGTZE UNIVERSITY
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