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Plug removing and inhibiting agent and plug removing and inhibiting method in viscous oil recovery

A plugging agent and a technology for removing plugging, applied in the field of plugging removal and blocking inhibitor, heavy oil production, and can solve the problems of low freezing point, poor asphaltene dissolution effect, and poor effect of precipitates with high asphaltene content. , to achieve the effect of inhibiting the formation of blockage, good dissolution and removal effect, and obvious effect of unblocking and blocking blocking.

Active Publication Date: 2017-11-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These types of wax removing and plugging removers have good effects on the dissolution of wax crystals, depressing the pour point, and preventing precipitation, but the effect on the precipitates with high asphaltene content is poor, which cannot meet the production needs
[0005] CN1456634A discloses a water-based wax remover and anti-wax agent, which mainly includes a wax crystal improver and a surfactant, which is suitable for wax removal in oil wells with high wax content, but has a poor dissolving effect on asphaltene. In some oil wells with higher asphaltene content does not apply in
[0006] CN1232855A discloses a wax remover composed of hydrocarbons, halogenated hydrocarbons and surfactants, which has the characteristics of fast wax-dissolving speed, high wax-dissolving amount, and low freezing point, but it is not suitable for some oil wells with high asphaltene content

Method used

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  • Plug removing and inhibiting agent and plug removing and inhibiting method in viscous oil recovery
  • Plug removing and inhibiting agent and plug removing and inhibiting method in viscous oil recovery
  • Plug removing and inhibiting agent and plug removing and inhibiting method in viscous oil recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1～ Embodiment 15-1 and comparative example 1-1～ comparative example 15-1

[0046] The various examples and comparative examples are used to illustrate the dissolving speed of different plugging inhibitors for plugging.

[0047] As shown in Table 1, the blockage-removing and anti-blocking agent was prepared according to different components and proportions, and 20g of the plugging-removing and anti-blocking agent were weighed and added to different 50mL conical flasks, and then added to each conical flask to make For the blockage sample of the sphere, close the bottle mouth, let it stand at a constant temperature at 50°C for 30 minutes, then weigh the residual amount of the blockage after drying, and calculate the dissolution rate. The experimental results are shown in Table 1.

[0048] Table 1

[0049]

[0050]

[0051]

[0052] From the results of the examples and comparative examples in Table 1, it can be seen that compared with using aromatic hydrocarbons or nitrogen-containing organic compounds or furan or fluorine-containing organic co...

Embodiment 1-2～ Embodiment 15-2 and comparative example 1-2～ comparative example 15-2

[0054] The various examples and comparative examples are used to illustrate the amount of clogging dissolved by different plugging inhibitors.

[0055] As shown in Table 2, the plugging-removing and blocking-inhibiting agents were prepared according to different components and ratios. Weighed 10g of blocking-breaking and blocking-reducing agents respectively and added them to different 100mL Erlenmeyer flasks. Stir at a rotating speed, and continuously add samples of clogging objects respectively until the clogging objects cannot be dissolved, and calculate the total dissolved amount of clogging objects that can be dissolved per g of plugging inhibitor. The experimental results are shown in Table 2.

[0056] Table 2

[0057]

[0058]

[0059]

[0060] From the results of the examples and comparative examples in Table 2, it can be seen that, compared with using aromatic hydrocarbons or nitrogen-containing organic compounds or furan or fluorine-containing organic compo...

Embodiment 1-3～ Embodiment 15-3 and comparative example 1-3～ comparative example 15-3

[0062] The various examples and comparative examples are used to illustrate the inhibitory effect of different plugging inhibitors on the formation of plugging objects.

[0063] As shown in Table 3, according to different components and proportions, the plugging-removing and suppressing agent was prepared, and 10 g of plugging-removing and suppressing agent were weighed and added to different 100mL conical flasks, and more than its Saturated dissolved 1# blockage, stirred with a magnetic stirrer at 200 rpm for 3 hours at 50°C to fully dissolve the blockage, and then filtered out the undissolved residue with filter paper. Put the blockage filtrate in a closed volumetric flask, let it stand at a constant temperature of 50°C, regularly observe whether there is precipitation at the bottom of the filtrate, and calculate the stabilization time of the blockage filtrate. The experimental results are shown in Table 3.

[0064] table 3

[0065]

[0066]

[0067]

[0068] From...

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Abstract

The invention relates to the field of oil field oil production engineering, and discloses a plug removing and inhibiting agent and a plug removing and inhibiting method in viscous oil recovery. The provided plug removing and inhibiting agent comprises aromatic hydrocarbons and nitrogen containing organic compounds. The block removing method in viscous oil recovery comprises a step of contacting the plug removing and inhibiting agent with a blocking substance. The block inhibiting method comprises a step of injecting the plug removing and inhibiting agent into an oil well to contact the plug removing and inhibiting agent with viscous oil. The plug removing and inhibiting agent has a good effect on dissolving and eliminating blocking substances, which has a high asphalt content, in pit shafts and pipelines of a viscous oil field, and is capable of well inhibiting the formation of blocking substances.

Description

technical field [0001] The invention relates to the field of oil production engineering, in particular to a plugging inhibitor, a plugging removal method in heavy oil production, and a plugging suppression method in heavy oil production. Background technique [0002] Heavy oil contains a lot of asphaltenes, colloids and paraffins. These substances are prone to be precipitated with changes in pressure and temperature during the mining process, and adhere to oil wells and pipelines to cause blockage. [0003] Usually, paraffin is the main component of oil well plugging, but for heavy oil with high asphaltene content, the plugging often contains a large amount of asphaltene. In the production process of heavy oil with high asphaltenes, the proportion of saturated hydrocarbons and aromatics is not suitable or the proportion of colloids and asphaltene is not matched. When the temperature and pressure are reduced to a certain extent, asphaltenes will be precipitated. This mixed p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524E21B37/06
CPCC09K8/524E21B37/06
Inventor 罗咏涛黄娟江建林王秀李伟
Owner CHINA PETROLEUM & CHEM CORP
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