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A plug-removing and suppressing agent and its application and method for plugging-removing and suppressing in heavy oil production

A technology of plugging removal and plugging agent, applied in plugging removal and suppression agent and its application, a plugging removal and plugging suppression field in heavy oil production, which can solve the poor effect of precipitates with high asphaltene content , unable to meet production needs, poor dissolving effect of asphaltene, etc., to achieve low cost, good dissolution and removal effect, and obvious effect of plugging removal and suppression

Active Publication Date: 2020-07-28
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 removers have good effects on the dissolution of wax crystals, depreciation and anti-precipitation, but have poor effects on precipitates with high asphaltene content, which cannot meet production needs
[0005] CN1456634A introduces 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 not applicable
[0006] CN1232855A introduces 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 suppressing agent and its application and method for plugging-removing and suppressing in heavy oil production
  • A plug-removing and suppressing agent and its application and method for plugging-removing and suppressing in heavy oil production
  • A plug-removing and suppressing agent and its application and method for plugging-removing and suppressing in heavy oil production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9 and comparative example 1-10

[0054] The various examples and comparative examples are used to illustrate the dissolving effects of different plugging inhibitors on plugging.

[0055] Blockage dissolution test: Prepare plugging inhibitors according to different compositions and ratios, weigh 10g of plugging inhibitors into a 100mL Erlenmeyer flask, stir at a constant temperature of 50°C, and continuously add plugging samples until The blockage cannot be dissolved, and the total dissolved amount of the blockage that can be dissolved by each g of plugging inhibitor can be calculated. The experimental results are shown in Table 2.

[0056] Table 2 Comparison of dissolved amount of blockage

[0057]

[0058] According to the results in Table 2, it can be known that the blockage dissolving amount of the blockage removing and suppressing agent of the formula adopted in the present invention is obviously better than that of the comparative example, and has an obviously excellent effect of dissolving blockages...

Embodiment 10-18 and comparative example 11-20

[0061] The various examples and comparative examples are used to illustrate the inhibitory effects of different plugging inhibitors on plugging.

[0062] Blockage inhibition experiment: Prepare plugging inhibitors according to different compositions and ratios, weigh 10g of plugging inhibitors into a 100mL Erlenmeyer flask, add more than its saturated dissolved amount of plugging substances, and keep the temperature at 50°C Stir for a while to fully dissolve the clog, then filter out the undissolved residue with filter paper. Put the blockage solution 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 solution, and calculate the stability time of the blockage solution. The experimental results are shown in Table 3.

[0063] Table 3 Comparison of blockage inhibition effects

[0064]

[0065]

[0066] According to the results in Table 3, it can be known that the blocking remo...

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Abstract

The invention discloses a plug-removing blockage-suppressing agent and application thereof, and a method for removing plug and suppressing blockage in heavy oil exploitation, belonging to the field ofoil production engineering of oil fields. The plug-removing blockage-suppressing agent contains coal tar and alpha-naphthalene sulfonic acid, wherein the content of alpha-naphthalene sulfonic acid is0.1 to 5 wt% on the basis of the weight of the plug-removing blockage-suppressing agent. The plug-removing blockage-suppressing agent provided by the invention is especially applicable to removal ofplug produced in exploitation of high-asphaltene heavy oil and can effectively inhibit the formation of plug.

Description

technical field [0001] The invention relates to the field of oil production engineering, in particular to a plugging inhibitor and its application, a method for removing plugging in heavy oil production, and a method for suppressing plugging 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 or the proportion of colloids and asphaltenes often appear inappropriate. When the temperature and pressure are reduced to a certain extent, asphaltenes will be p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524E21B37/06
CPCC09K8/524E21B37/06
Inventor 罗咏涛秦冰
Owner CHINA PETROLEUM & CHEM CORP
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