Asphalt reinforced foam plugging agent suitable for selective water plugging of oil-water well and preparation method and application thereof

A selective, oil-water well technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as complex process, high implementation cost, and inability to fully exert the performance of plugging agents, reaching the applicable level Extensive, enhanced strength and elasticity, good filling effect

Active Publication Date: 2020-12-08
陕西博石源丰能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All kinds of plugging agents have their own advantages and disadvantages, and there are common problems such as complex process, high implementation cost, or the performance of blocking agents cannot be fully exerted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Example 1 A bitumen-enhanced foam water plugging agent suitable for selective water plugging and profile control of oil and water wells

[0035]Composition: (mass percentage)

[0036]Petroleum pitch (softening point 40℃): 65%

[0037]Foaming agent: 1.5%

[0038]Toluene: 33.5%

[0039]Nitrogen content: 80%

[0040]Prepared by the following method:

[0041]1) Heat the petroleum pitch to soften it and heat it to a molten state;

[0042]2) Prepare a surfactant solution, add a foaming agent to toluene for agitation reaction to obtain a surfactant solution;

[0043]3) Mix and stir molten petroleum pitch and surfactant solution;

[0044]4) Step 3) The obtained molten petroleum asphalt and surfactant solution mixture is filled with nitrogen and stirred, and a large number of tiny, uniform and stable bubbles are generated during the stirring process to obtain asphalt reinforced foam.

Embodiment 2

[0045]Example 2 A bitumen-enhanced foam water plugging agent suitable for selective water plugging and profile control of oil and water wells

[0046]Composition: (mass percentage)

[0047]Petroleum asphalt (softening point 40℃): 40%

[0048]Foaming agent: 2.5%

[0049]Carbon tetrachloride: 57.5%

[0050]Carbon dioxide content: 90%

[0051]Prepared by the following method:

[0052]1) Heat the petroleum pitch to soften it and heat it to a molten state;

[0053]2) Prepare a surfactant solution, add a foaming agent to carbon tetrachloride to perform a stirring reaction to obtain a surfactant solution;

[0054]3) Mix and stir molten petroleum pitch and surfactant solution;

[0055]4) Step 3) The obtained molten petroleum asphalt and surfactant solution mixture is filled with carbon dioxide and stirred. A large number of tiny, uniform and stable bubbles are generated during the stirring process to obtain a reinforced asphalt foam.

Embodiment 3

[0056]Example 3 A bitumen-enhanced foam water plugging agent suitable for selective water plugging and profile control of oil and water wells

[0057]Composition: (mass percentage)

[0058]Petroleum asphalt (softening point 40℃): 55%

[0059]Foaming agent: 1.0%

[0060]Toluene: 44%

[0061]Carbon dioxide and nitrogen mixed gas content: 70%

[0062]Prepared by the following method:

[0063]1) Heat the petroleum pitch to soften it and heat it to a molten state;

[0064]2) Prepare a surfactant solution, add a foaming agent to toluene to perform a stirring reaction to obtain a surfactant solution;

[0065]3) Mix and stir molten petroleum pitch and surfactant solution;

[0066]4) Step 3) The obtained molten petroleum pitch and surfactant solution mixture is fed with a carbon dioxide gas and nitrogen mixed gas and stirred. A large number of tiny, uniform and stable bubbles are generated during the stirring process to obtain a reinforced asphalt foam.

[0067]The asphalt-reinforced foam prepared in the above three embodim...

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PUM

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Abstract

The invention relates to an asphalt reinforced foam plugging agent suitable for selective water plugging of an oil-water well and a preparation method and application thereof. The asphalt reinforced foam plugging agent comprises the following components in percentage by mass: 0.5%-3% of a foaming agent, 35%-70% of petroleum juice; and remaining solvents. The foam gas content is 70-95%. A stratum water phase channel is plugged selectively without affecting circulation capability of an oil-phase channel. Compared with other plugging agents, due to the source and characteristics of petroleum asphalt, the plugging agent has the advantages that the anti-aging performance is high, the damage effect of durable plugging on the stratum is avoided, and real-time plugging removal can be performed according to actual requirements after the action.

Description

Technical field[0001]The present invention relates to the technical field of oilfield development, and relates to a selective water plugging asphalt-enhanced foam plugging agent suitable for oil-water wells and a preparation method and application thereof, which are used to reduce the water content of produced fluids and improve recovery efficiency.Background technique[0002]Major domestic onshore oil fields have entered the period of medium and high water cut production. Some measures to enhance the productivity of oil wells have been widely used, which has accelerated the increase in water breakthrough and water cut of produced fluids. Moreover, due to the heterogeneity of the oil layer, there will be phenomena such as water intrusion and channeling in the oil layer. In order to improve the effect of water injection and the ultimate recovery of the oil field, technical measures for water plugging and profile control need to be taken in time.[0003]The purpose of water plugging and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/518C09K8/514E21B33/13
CPCC09K8/518C09K8/514E21B33/13
Inventor 曾亚勤张学仓陈荣
Owner 陕西博石源丰能源科技有限公司
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