Nano-silica emulsifying water plugging agent and application thereof

A technology of nano-silica and water blocking agent, which is applied in the direction of chemical instruments and methods, wellbore/well components, drilling compositions, etc., can solve the problems of complex composition and difficult implementation of water blocking agent, and achieve simple composition , the effect of high plugging strength

Inactive Publication Date: 2016-02-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a nano-silica emulsified water shutoff agent in order to obtain a water shutoff agent that can make the emulsion stable and h

Method used

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  • Nano-silica emulsifying water plugging agent and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This example is used to illustrate the nano-silica emulsified water shutoff agent provided by the present invention and its application.

[0032] Add Ludox HS-40 and surfactants to water to dissolve them to prepare 6 mL of nano-silica emulsified water shutoff agent. The names and contents of each component are shown in Table 1.

[0033] When applying the 6mL nano-silica emulsified water shutoff agent, hydrochloric acid is added to it to adjust the pH to a suitable value. Add 15 mL of crude oil (density of about 0.91 g / mL, viscosity of about 60 mPa·s at 50°C) according to the volume ratio of dose to oil of 0.4:1, and mix vigorously with a shaking mixer to form an emulsion. Put the prepared emulsion in an oven at a constant temperature of 80° C. and let it stand for 48 hours, observe the stability of the emulsion and determine the viscosity. The adjusted pH value and the observation and measurement results are listed in Table 1. The content given in Table 1 is wt%, the same ...

Embodiment 2

[0035] This example is used to illustrate the nano-silica emulsified water shutoff agent provided by the present invention and its application.

[0036] Add LM-150 and surfactants to water to dissolve them to prepare 14 mL of nano-silica emulsified water shutoff agent. The names and contents of each component are shown in Table 1.

[0037] When applying the 14 mL nano-silica emulsified water shutoff agent, hydrochloric acid is added to it to adjust to a proper pH value. Add 20 mL of crude oil (density of about 0.91 g / mL, viscosity of about 60 mPa·s at 50°C) according to the volume ratio of dose to oil of 0.7:1, and vigorously mix with a shaking mixer to form an emulsion. Put the prepared emulsion in an oven at a constant temperature of 80° C. and let it stand for 48 hours, observe the stability of the emulsion and determine the viscosity. The adjusted pH value and the observation and measurement results are listed in Table 1.

Embodiment 3

[0039] This example is used to illustrate the nano-silica emulsified water shutoff agent provided by the present invention and its application.

[0040] Add AEROSIL200 and surfactants to water to dissolve them to prepare 11mL nano-silica emulsified water shutoff agent. The names and contents of each component are shown in Table 1.

[0041] When applying the 11mL nano-silica emulsified water shutoff agent, hydrochloric acid is added to it to adjust the pH to a suitable value. Add 20mL of crude oil (density about 0.91g / mL, viscosity about 60mPa·s at 50°C) according to the volume ratio of oil agent at 0.55:1, and mix vigorously with a shaking mixer to form an emulsion. Put the prepared emulsion in an oven at a constant temperature of 80° C. and let it stand for 48 hours, observe the stability of the emulsion and determine the viscosity. The adjusted pH value and the observation and measurement results are listed in Table 1.

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Abstract

The invention discloses a nano-silica emulsifying water plugging agent and application thereof. The nano-silica emulsifying water plugging agent comprises the following components: 0.5-20wt% of nano-silica, 0.02-5wt% of a surfactant and the balance of water. When the nano-silica emulsifying water plugging agent is applied to crude oil, a uniform and stable emulsion with relatively high viscosity can be acquired, so that relatively high plugging strength is achieved; the water plugging agent is simple in composition and easy for oil field application.

Description

Technical field [0001] The invention relates to a nano silica emulsified water plugging agent and its application, in particular to a nano silica emulsified water plugging agent used for water plugging and profile control in oil well development, and the nano silica emulsifying water plugging agent Aqueous agent is used to plug water in oil wells. Background technique [0002] In the process of oilfield development, water plugging and profile control is an important technical means to "stabilize oil and control water". At present, there are two main types of water shutoff agents for oil wells, one is non-selective plugging agents, and the other is selective plugging agents. Because non-selective plugging agents are not selective, it is easy to cause damage to the oil layer in the multi-layered formation, which seriously affects the productivity of the oil well, and the plugging construction technology is complicated, the process is numerous, and the operation cost is high. Howe...

Claims

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Application Information

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IPC IPC(8): C09K8/508E21B33/13
Inventor 罗咏涛江建林侯钰
Owner CHINA PETROLEUM & CHEM CORP
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