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Water based dewaxing agent for oil collecting and displacing wells

A water-based, wax-removing technology, used in cleaning appliances, wellbore/well components, earth-moving drilling, etc., can solve problems such as low cost, inability to achieve the expected effect of wax-removing, and a large proportion of wax-removing agents , to achieve good effect

Inactive Publication Date: 2003-11-19
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the limitation of the application range of the existing wax removal and control technology and the inability of the current oil-based wax removal and control agent to achieve the expected effect of wax removal and control after dosing, the present invention provides a water-based wax removal and control solution for polymer flooding wells. The anti-wax agent has a large specificity and low cost, and can achieve a better effect of wax and anti-wax

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: In a polymer flooding well in Well 3-J6-P33 in North Daqing, heat washing and the existing wax removing and preventing agent were used to remove and prevent wax. The wax preventing rate was 65.3%, and the viscosity reduction rate was 50.6%. The wax removing and preventing agent of the above scheme 2 has a PH value of 8, is non-corrosive to mining equipment, has a wax preventing rate of 81.3%, and a viscosity reducing rate of 65.6%. The washing cycle is 68 days.

Embodiment 2

[0011] Example 2: A polymer flooding well in Well 2-4-P58 in North Daqing used to use hot washing and the existing wax removing and preventing agent to remove and prevent wax. The wax preventing rate was 59.3%, and the viscosity reducing rate was 45.6%. The paraffin-removing agent of the above-mentioned scheme 2 has a PH value of 8, is non-corrosive to the crude oil produced, the paraffin-prevention rate is 82.3%, and the viscosity-reducing rate is 65.2%. The washing cycle is 75 days.

Embodiment 3

[0012] Example 3: In a polymer flooding well in Well 2-J4-P51 in North Daqing, heat washing and the existing wax removing and preventing agent were used to remove and prevent wax. The wax preventing rate was 68.7%, and the viscosity reduction rate was 56.4%. The wax removing and preventing agent of the above scheme 2 has a PH value of 8, is non-corrosive to the crude oil produced, the wax preventing rate is 84.9%, and the viscosity reducing rate is 62.1%. The washing cycle is 68 days.

[0013] According to the ratio of the ingredients in the above table, the effect and the field application: the wax remover uses water as the dispersion medium, and the main components are water-soluble surfactants and wax crystal improvers. Factors, safe and reliable; in addition, the oil pipe and the wax crystal modifier with higher melting point have higher surface energy, after contacting with general liquid, the surface energy of the system will be greatly reduced, and the solid surface wil...

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Abstract

A water-base antiwax inhibitor for oil-gathering or oil-displacing wells in oil field contains wax crystal improver, disperser, cosolvent, surfactant and water. Its advantages are high safety, high antiwax and pour-inhibiting effect, and low setting point (-35 deg.C).

Description

Technical field: [0001] The invention relates to a medicament used in the field of oil production engineering, in particular to a medicament used in the production fluid of polymer flooding wells, which belongs to the water-based wax remover and anti-wax agent for polymer flooding wells. Background technique: [0002] At present, due to the change of the oil displacement method in the oil field, from water flooding to polymer flooding, the properties of the produced fluid have changed greatly, especially as the polymer concentration of the produced fluid increases year by year, the eccentric wear of rods and pipes, clear water, etc. Problems such as the difficulty of wax prevention are becoming more and more serious, manifested in the increase of the upward load and downward resistance of the pumping well, which may easily cause the rod and pipe to break off, increase the number of inspections of the stuck pump well, and cause considerable production loss and other energy con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06
Inventor 陈会军李淑红张居华陈刚刘玉龙
Owner DAQING OILFIELD CO LTD
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