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Emulsion-type oil well viscosity-reducing, wax-removing and anti-wax agent and its application method

An emulsion type, wax removal and prevention technology, applied in chemical instruments and methods, cleaning appliances, earth-moving drilling, etc., can solve problems such as shutdown operations, wax crystal deposition, and impact on crude oil production.

Inactive Publication Date: 2014-10-01
中国石化集团河南石油勘探局基地(市政)管理中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dosing methods on oil wells often adopt continuous and impact dosing methods. Continuous dosing will result in a small amount of dosing in an instant, and wax crystals will be deposited for a long time; while traditional impact dosing often requires Shutdown operations affect the normal production of crude oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] For a single well in Zhaoao Oilfield, the oil well production season is summer, and the temperature is not higher than 34°C. According to the actual situation of wax formation in the oil well on site, the specific content (mass percentage) of each component in the produced fluid: wax content 27%, gum Asphaltene + asphaltene content 25%, the ratio (mass %) of each component of the selected anti-wax viscosity reducer is as follows: cyclohexane 40%, emulsifier 3%, dispersant MF 15%, surfactant LAS 12 %, sodium hydroxide 5%, penetrant JFC 3% and water 22%, the emulsifier is a compound of oleic acid and sodium oleate, wherein the weight ratio of oleic acid and sodium oleate is 5:3.

[0011] The above-mentioned materials are directly stirred to form a microemulsion mixture, which is the emulsion-type oil well viscosity-reducing wax-reducing agent of the present invention, which is ready for use.

[0012] The dosing method adopts the dosing method of the vehicle-mounted high-p...

Embodiment 2

[0014] For a single well in Zhangdian Oilfield, the production season of the oil well is winter, and the temperature is not higher than 20°C. According to the actual situation of wax deposition in the oil well on site, the specific content (mass percentage) of each component in the produced fluid: wax content 33%, gum Asphaltene + asphaltene content 17%, the ratio (mass %) of each component of the anti-wax viscosity reducer is selected as follows: cyclohexane 37%, emulsifier 1.2%, dispersant MF5%, surfactant LAS 14% , sodium hydroxide 7%, penetrant JFC 1.5% and water 34.3%, the emulsifier is a compound of oleic acid and sodium oleate, wherein the weight ratio of oleic acid and sodium oleate is 4:3.

[0015] The above-mentioned materials are directly stirred to form a microemulsion mixture, which is the emulsion-type oil well viscosity-reducing wax-reducing agent of the present invention, which is ready for use.

[0016] The dosing method adopts the dosing method of the vehicle...

Embodiment 3

[0018] For a single well in Zhangdian Oilfield, the oil well production season is spring and autumn, and the temperature is 22°C. According to the actual situation of wax deposition in the oil well on site, the specific content (mass percentage) of each component in the produced fluid: wax content 32%, colloid + The content of asphaltene is 23%, and the ratio (mass%) of each component of the selected anti-wax viscosity reducer is as follows: 35% cyclohexane, 2% emulsifier, 7% dispersant MF, 13% surfactant LAS, hydrogen Sodium oxide 6%, penetrant JFC 2.5% and water 34.5%. The emulsifier is a compound of oleic acid and sodium oleate, wherein the weight ratio of oleic acid to sodium oleate is 3:3.

[0019] The above-mentioned materials are directly stirred to form a microemulsion mixture, which is the emulsion-type oil well viscosity-reducing wax-reducing agent of the present invention, which is ready for use.

[0020] The dosing method adopts the dosing method of the vehicle-mou...

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PUM

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Abstract

The invention belongs to the technical field of oilfield application chemistry, and discloses an emulsion-type oil well viscosity-breaking paraffin removing and inhibiting agent and an application method thereof. The emulsion-type oil well viscosity-breaking paraffin removing and inhibiting agent comprises the following components in percentage by mass: 20-40% of cyclohexane, 1-3% of emulsifier, 2-15% of dispersant, 5-15% of surfactant LAS, 5-7% of sodium hydroxide, 0.5-3% of penetrant JFC and 17-66.5% of water. The emulsifier is a compounded substance of oleic acid and sodium oleate in a weight ratio of (3-5):(2-4). The agent is added in a pressure impact mode, wherein the bearing pressure is 0.3-4 MPa, the addition period is 2-3 days, the addition concentration is determined according to the paraffin and colloid+asphalt content of different oil well output liquids, and the calculation base number of the addition concentration is the liquid-producing capacity of a single oil well. The paraffin removing and inhibiting agent disclosed by the invention can effectively implement the functions of paraffin inhibition and viscosity breaking, so that the paraffin inhibition rate can be greater than 0.025 g / min, and the viscosity breaking rate can be greater than 30%; and the invention can implement quick demulsification at shaft temperature, thereby fully displaying the function of the organic solvent on removing deposited paraffin.

Description

technical field [0001] The invention belongs to the technical field of oilfield applied chemistry, and in particular relates to an emulsion-type oil well viscosity-reducing, wax-removing and anti-waxing agent and a using method thereof. Background technique [0002] At present, the wax content of crude oil in my country is generally high, and the precipitation of wax during crude oil extraction seriously affects production. There are mainly oil-based, water-based and emulsion-based wax removers. The emulsion type has the advantages of both oil-based and water-based wax removers. It not only retains the wax-removing effects of organic solvents and surfactants, but also overcomes the oil-based The shortcomings of the type wax remover and anti-wax agent are that they are more toxic to the human body and the water-based type of wax remover and anti-wax agent is greatly affected by temperature, so as to achieve the effect of wax removal and anti-wax. The dosing methods on oil we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524E21B37/06
Inventor 李兴涛付海兵杨东伟葛小珍彭森吕永恒张旭升
Owner 中国石化集团河南石油勘探局基地(市政)管理中心
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