A plug-removing and plug-restraining agent and a method for plug-removing and plug-suppressing in heavy oil production

A technology of plugging removal and plugging agent, which is applied in the field of plugging removal and suppression agent and plugging suppression in 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, etc. , to achieve the effects of inhibiting the formation of blockages, good dissolution and removal effects, and obvious effects of blockage removal and blockage suppression

Active Publication Date: 2021-02-09
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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  • A plug-removing and plug-restraining agent and a method for plug-removing and plug-suppressing in heavy oil production
  • A plug-removing and plug-restraining agent and a method for plug-removing and plug-suppressing in heavy oil production
  • A plug-removing and plug-restraining agent and a method for plug-removing and plug-suppressing in heavy oil production

Examples

Experimental program
Comparison scheme
Effect test

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

[0046] The examples and comparative examples are used to illustrate the dissolving speed of the blockage by different blockage removal and blockage inhibitors.

[0047] As shown in Table 1, according to different components and proportions, the blocking release and blocking inhibitor was prepared, and 20 g of the blocking release and blocking inhibitor were weighed and added to different 50mL conical flasks, and then added to each conical flask to make For the spherical plug sample, close the bottle mouth, let it stand at a constant temperature of 50 ° C for 30 minutes, and then weigh the residual amount of the dried plug to 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 the single component of aromatic hydrocarbons or nitrogen-containing organic compounds or furans or fluorine-con...

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 dissolving the blockages by different plugging-removing and blocking-inhibiting agents.

[0055] As shown in Table 2, according to different components and proportions, the blocking removal and blocking inhibitor was prepared, and 10 g of the blocking removal and blocking inhibitor were respectively weighed and added to different 100mL conical flasks. Stir at the rotating speed, and continuously add the blockage samples until the blockage cannot be dissolved, and calculate the total dissolved amount of the blockage that can be dissolved by each g of the blockage release and blockage 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 the single component of aromatic hydrocarbons or nitrogen-containing organic compounds...

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 plug-removing and plug-inhibiting agents on the formation of plugs.

[0063] As shown in Table 3, according to different components and proportions, the blocking release and blocking inhibitor was prepared, and 10 g of the blocking release and blocking inhibitor were respectively weighed and added to different 100mL conical flasks, and more than The 1# blockage with the saturated dissolved amount was stirred with a magnetic stirrer at 200rpm for 3h at 50°C to fully dissolve the blockage, and then the undissolved residue was filtered out with filter paper. Place the plugged 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 stability time of the plugged filtrate. The experimental results are shown in Table 3.

[0064] table 3

[0065]...

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Abstract

The invention relates to the field of oil production engineering in oil fields, and discloses a plugging removal and suppression agent and a plugging removal and suppression method in heavy oil exploitation. The plugging removal and suppression agent of the invention contains aromatic hydrocarbons and nitrogen-containing organic compounds. The plug-removing method in heavy oil recovery of the present invention comprises: contacting the plug-removal and plug-reducing agent of the present invention with plugs. The method for suppressing plugging in heavy oil production of the present invention comprises: injecting the plugging removing and suppressing agent of the present invention into an oil well to contact with heavy oil. The plugging removing and suppressing agent of the present invention has better dissolving and removing effects on heavy oil wellbore plugging and pipeline plugging with higher asphaltene content, and can well inhibit the formation of plugging.

Description

technical field [0001] The invention relates to the field of oilfield oil production engineering, in particular to a plugging-relieving and blocking-inhibiting agent, a method for removing plugging in heavy oil production, and a method for inhibiting plugging in heavy oil production. Background technique [0002] Heavy oil contains a lot of asphaltenes, colloids and paraffins. These substances are prone to precipitation with the changes of pressure and temperature during the production process, and adhere to oil wells and pipelines to cause blockage. [0003] Usually, paraffin is the main component of oil well plugs, but for heavy oils with high asphaltene content, the plugs often contain a large amount of asphaltenes. In the production process of high asphaltene heavy oil, the proportion of saturated hydrocarbons and aromatic hydrocarbons is often inappropriate or the ratio of colloid and asphaltenes is not matched. When the temperature and pressure are reduced to a certain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B37/06
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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