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Preparation of a clay anti-swelling agent for water injection with oil washing effect

A technology of anti-swelling agent and clay, applied in the field of preparation of clay anti-swelling agent, to achieve good effect, reduce water lock damage, and reduce dosage

Inactive Publication Date: 2020-06-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The currently used clay anti-swelling agent only has the function of preventing clay swelling and migration. To reduce water lock damage and emulsification damage, surfactants and anti-emulsion demulsifiers must be used alone; to improve oil washing efficiency, water injection has Like the effect of surfactant flooding in tertiary oil recovery, you must use surfactant washing agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: The self-made A raw material, the processed B raw material and C, D, E, F and G are evenly compounded and mixed to obtain H clay anti-swelling agent with oil washing effect, wherein the mass ratio of each raw material is: A: B:C:D:E:F:G=15%:5%:30%:1%:22%:25%:2%, H was dissolved in tap water respectively, and the mass concentrations were respectively 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% solutions, at room temperature (25 ℃), use the centrifugation method to measure the anti-swelling rate of clay compared with tap water; surface tension; interfacial tension after adding kerosene in the H solution; Artificial cores with a permeability of about 20.7×10-3 μm2 were saturated with simulated oil prepared from a 1:1 mixture of crude oil and kerosene in the Shinan 21 well area of ​​the Luliang Oilfield operation area of ​​Xinjiang Oilfield Branch, and tap water and different concentrations of Under the injection rate of 0.2mL / min and the back pressure higher than the ring...

Embodiment 2

[0043] Embodiment 2: The self-made A raw material, the processed B raw material and C, D, E, F and G are evenly compounded and mixed to obtain H clay anti-swelling agent with oil washing effect, wherein the mass ratio of each raw material is: A: B:C:D:E:F:G=20%:7%:25%:1%:20%:25%:2%, H was dissolved in tap water respectively, and the mass concentrations were respectively 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% solutions, at room temperature (25°C), use the same evaluation method as in Example 1; anti-swelling ratio, surface tension, interfacial tension and oil displacement efficiency compared with tap water at different concentrations The improvement rate performance is:

[0044] 1) The anti-swelling rates of H clay with concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% were 86.3%, 90.5%, 92.7% and 94.8%, respectively;

[0045] 2) The surface tensions of H with concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% are: 25.5mN / m, 24.8mN / m, 23.8mN / m and 22.9mN / m;

[0046] 3) The inte...

Embodiment 3

[0049] Embodiment 3: The self-made A raw material, the processed B raw material and C, D, E, F and G are evenly compounded and mixed to obtain H clay anti-swelling agent with oil washing effect, wherein the mass ratio of each raw material is: A: B:C:D:E:F:G=20%:10%:30%:2%:15%:20%:3%, H was dissolved in tap water respectively, and the mass concentrations were respectively 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% solutions, at room temperature (25°C), use the same evaluation method as in Example 1; anti-swelling ratio, surface tension, interfacial tension and oil displacement efficiency compared with tap water at different concentrations The nature of the increase rate is:

[0050] 1) The anti-swelling rates of H clay with concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% were 85.9%, 90.2%, 92.5% and 94.5%, respectively;

[0051] 2) The surface tensions of H with concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% are: 24.3mN / m, 23.5mN / m, 22.3mN / m and 21.8mN / m;

[0052] 3) The inte...

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Abstract

The invention provides preparation of a clay anti-swelling agent with an oil washing effect and for water injection. According to the clay anti-swelling agent, the composition use of a self-synthesized clay anti-swelling cationic surfactant and cheap ammonium phosphate, ammonium chloride and potassium chloride is disclosed, and the agent has the better capability of preventing hydration and swelling of clay particles; in composition with dodecyl ethoxy betaine and propylene glycol polyoxyethylene polyoxypropylene ether demulsifier, the clay anti-swelling agent not only has the oil washing function but also prevents emulsification and achieves the effect of avoiding the situation that blockage damage is caused by emulsification during oil washing; in composition with a trimethyl-1-propanaminium iodide surfactant, the clay anti-swelling agent has the excellent capability of reducing surface tension and interfacial tension and greatly reduces and prevents water lock damage. Thus, the developed clay anti-swelling agent has the triple effects of preventing clay swelling, reducing the surface tension and the ultra-low interfacial tension to prevent water lock and to wash oil, and the agent plays an innovative demonstration role in developing the multifunctional clay anti-swelling agent for water injection.

Description

technical field [0001] The invention relates to the preparation of a clay anti-swelling agent which is suitable for oil field water injection and has oil washing effect. Background technique [0002] 83.6% of my country's onshore thin oil fields are developed through water injection, and water injection development is also the most economical development method. Oilfields are all processed by oil-water separation of produced fluid and re-injection after sewage treatment. The incompatibility between the injected water and the rock minerals of the reservoir and the incompatibility between the external fluid and the reservoir fluid often cause formation blockage, reduce the permeability of the reservoir, and increase the water injection pressure, especially for low-permeability reservoirs , are more vulnerable to damage, leading to rapid rise in water injection pressure of water injection wells and increasingly serious under-injection, thus reducing water flooding recovery. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/58
CPCC09K8/58C09K8/584C09K2208/12
Inventor 马喜平黄莉杨苗李俊辰廖明飞卿大咏
Owner SOUTHWEST PETROLEUM UNIV
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