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An intralayer self-generating system for removing plugging and increasing energy in oil-water wells and its application method

A self-generating, oil-water well technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high reservoir temperature requirements, complex construction technology, low pipe string corrosion, etc., and achieve better results, Simple process and the effect of saving construction time

Active Publication Date: 2015-11-18
CHINA PETROCHEM & CHEM JIANGSU OILFIELD BRANCH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an intralayer self-generating system for removing plugging and increasing energy in oil-water wells, so that it can overcome the high requirements of reservoir temperature (greater than 90°C), low gas generation or complicated construction technology in the current conventional gas generation system The disadvantages are that it has good reservoir temperature adaptability (greater than 50°C), large amount of gas generation, large heat generation, low corrosion to the pipe string and simple construction process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] An intralayer self-generating system for oil-water well plugging removal and energy-increasing, comprising components with the following weight content:

[0034] Urea 3%;

[0035] Sodium nitrite 7%;

[0036] Methyl formate 6%;

[0037] Water 84%.

[0038] During the experiment, 100ml of solution was prepared according to the above ratio, stirred evenly to fully dissolve the solid, and the temperature was raised to 50°C to generate a large amount of gas. The gas production time was 3.5 hours, and the gas production volume was 940ml.

[0039] When using on-site, follow the steps below:

[0040] 1) Weigh each component according to the proportioning relationship of this embodiment;

[0041] 2) Mix the components in the liquid distribution tank at room temperature and pressure, and stir well to make the components evenly mixed;

[0042] 3) Inject a single slug of the mixed liquid into the oil-bearing formation above 50°C, and shut down the well for 2-4 days (adjust acc...

Embodiment 2

[0044] An intralayer self-generating system for oil-water well plugging removal and energy-increasing, comprising components with the following weight content:

[0045] Urea 5%;

[0046] Sodium nitrite 12%;

[0047] Methyl formate 10%;

[0048] Water 73%.

[0049] During the experiment, 100ml of solution was prepared according to the above ratio, stirred evenly to fully dissolve the solid, and the temperature was raised to 50°C to generate a large amount of gas. The gas production time was 5 hours, and the gas production volume was 1560ml.

[0050] During use, it is identical with the step of embodiment 1.

Embodiment 3

[0052]An intralayer self-generating system for removing plugging and increasing energy in oil and water wells, which is composed of components with the following weight content:

[0053] Urea 8%;

[0054] Sodium nitrite 18%;

[0055] Methyl formate 20%;

[0056] Water 51%;

[0057] Fluoride salts 3%.

[0058] During the experiment, 100ml of solution was prepared according to the above ratio, stirred evenly to fully dissolve the solid, and the temperature was raised to 50°C, a large amount of gas was generated in the reaction, the gas generation time was 6.5h, and the gas production volume was 2250ml.

[0059] During use, it is identical with the step of embodiment 1.

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PUM

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Abstract

The invention relates to a gas self-production system used for plug removal and energy increase of an oil-water well and an application method thereof. The gas self-production system comprises, by weight, 3-10% of urea, 5-25% of a nitrite, 5-25% of an activator and 40-85% of water. The nitrite is one of sodium nitrite, ammonium nitrite and potassium nitrite. The activator is one of methyl formate, ammonium amidosulfonate, ammonium-monochloracetat, hexamethylenetetramine and formaldehyde. When the gas self-production system is used, the above materials are mixed at ambient temperature under ambient pressure, and injected into oil-bearing strata having a temperature higher than 50 DEG C, so as to remove plug, increase energy and increase enhance rate. The gas self-production system can be applied for plug removal and energy increasing of low-pressure low-energy wells in an oil field scattered reserve unit.

Description

technical field [0001] The invention relates to a composition formula for improving the effect of removing plugging and increasing energy of oil-water wells, in particular to a self-generating system for removing plugging and increasing energy of low-pressure and low-energy wells in scattered reserve units of oil fields. Background technique [0002] In oil recovery technology, a self-generating system is used to remove plugging and increase energy in oil wells. The self-generating system can improve formation permeability, increase formation energy, adjust formation profile, and increase residual acid flowback rate to achieve the goal of increasing oil production. Target. [0003] The commonly used self-gas generation technology refers to injecting a compound system composed of one or two chemical components and various additives into the formation, and then reacting the gas generation system under the action of a catalyst or a certain formation temperature to generate a la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58
Inventor 杨付林邓建华薛芸朱伟民俞力
Owner CHINA PETROCHEM & CHEM JIANGSU OILFIELD BRANCH
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