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Methods of plugging removal and suppression in heavy oil production and application of nitrogen-containing organic compounds as plugging removal and suppression agents in heavy oil production

A technology of organic compounds and nitrogen heterocyclic compounds, which is used in the application field of nitrogen-containing organic compounds as plugging inhibitors in heavy oil production, and can solve the problem of poor effect of precipitates with high asphaltene content and asphaltene dissolution Poor, unable to meet the needs of production, etc., to achieve the effects of inhibiting the formation of blockages, good dissolution and removal effects, and obvious effects of blockage removal and suppression

Active Publication Date: 2020-12-04
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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  • Methods of plugging removal and suppression in heavy oil production and application of nitrogen-containing organic compounds as plugging removal and suppression agents in heavy oil production
  • Methods of plugging removal and suppression in heavy oil production and application of nitrogen-containing organic compounds as plugging removal and suppression agents in heavy oil production
  • Methods of plugging removal and suppression in heavy oil production and application of nitrogen-containing organic compounds as plugging removal and suppression agents in heavy oil production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1～ Embodiment 14-1

[0044] Example 1-1 to Example 14-1 and Comparative Example 1-1 to Comparative Example 6-1

[0045] The examples and comparative examples illustrate the method of dissolving the blockage.

[0046] As shown in Table 2, weigh 100g of thin oil into different 250mL Erlenmeyer flasks, add different types of plugging inhibitors and mix evenly to obtain thin oil containing plugging inhibitors, and then pour them into each cone Add the blockage sample into the shaped bottle, stir with a magnetic stirrer at 200 rpm for 2 hours at a temperature of 50°C, and weigh the amount of undissolved solids after drying. The experimental results are shown in Table 2. Dissolution rate is calculated according to the following formula: dissolution rate=(mass of sample of clog added-mass of undissolved solid) / mass of sample of clog added×100%

[0047] Table 2

[0048]

[0049]

[0050] From the results of the examples and comparative examples in Table 2, it can be seen that the method for dissol...

Embodiment 1-2～ Embodiment 14-2

[0051] Example 1-2~Example 14-2 and Comparative Example 1-2~Comparative Example 6-2

[0052] The examples and comparative examples illustrate methods of inhibiting plug formation.

[0053] As shown in Table 3, weigh 50g of thin oil into different 250mL Erlenmeyer flasks, add different types of plugging inhibitors and mix evenly to obtain thin oil containing plugging inhibitors, and then pour them into each cone Put the heavy oil sample into the conical flask and mix evenly. The mixed crude oil was left at 50°C for 90 days to observe whether there was precipitation at the bottom of the conical flask. The experimental results are shown in Table 3.

[0054] table 3

[0055]

[0056] From the results of the examples and comparative examples in Table 3, it can be seen that the method of using nitrogen-containing organic compounds as plugging inhibitors to suppress the formation of clogs in the present invention can obviously inhibit the precipitation of asphaltenes, while in th...

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Abstract

The invention relates to the field of oil field oil production engineering, and discloses a plug removing and inhibiting method in viscous oil recovery and an application of nitrogen containing organic compounds taken as a plug removing and inhibiting agent in viscous oil recovery. The block removing method in viscous oil recovery comprises a step of contacting a plug removing and inhibiting agent with a blocking substance, wherein the plug removing and inhibiting agent comprises nitrogen containing organic compounds. The block inhibiting method comprises the following steps: at first, mixing the plug removing and inhibiting agent with diluted oil, and then injecting the diluted oil, which comprises the plug removing and inhibiting agent, into an oil well to contact the diluted oil with viscous oil, wherein the plug removing and inhibiting agent comprises nitrogen containing organic compounds. The method has a good effect on dissolving and removing blocking substances with a high asphalt content and is capable of well inhibiting the formation of blocking substances.

Description

technical field [0001] The invention relates to the field of oilfield oil recovery engineering, in particular to a plugging removal method in heavy oil recovery, a plugging suppression method in heavy oil recovery and the application of nitrogen-containing organic compounds as plugging removal and suppression agents in heavy oil recovery. 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 te...

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 罗咏涛黄娟王征
Owner CHINA PETROLEUM & CHEM CORP
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