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Blocking remover for polymer pollutants

A technology of polymer and deblocking agent, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of fast reaction speed, low cost performance, hidden safety hazards, etc., to improve the effective working distance and control the reaction speed. , the effect of improving the degree of response

Active Publication Date: 2013-07-10
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of plugging agent is strongly oxidizing, and the oxidizing solution is very unstable, and it is not easy to store it for a long time (generally less than 15 days), and it cannot be stored in a metal container, and direct sunlight is strictly prohibited. Therefore, There are great safety hazards in the field application process
[0006] Moreover, the following problems still exist in the existing strong oxidizing plugging remover: 1. During storage, transportation and construction, the efficiency loss of the medicament is serious; 2. The reaction speed is too fast (generally about 30 minutes), and the effective effect Short distance; 3. High cost, low cost performance, difficult to achieve a large processing radius

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a plugging remover for polymer pollutants. The raw material composition of the plugging remover includes: sodium nitrite (purity 99.5wt%), urea (purity 99.5wt%), industrial hydrochloric acid (concentration 30wt%), formaldehyde (concentration is 35wt%), potassium chloride (purity 99.5wt%), wherein, the mass ratio of sodium nitrite, urea, industrial hydrochloric acid is about 1: 0.22: 1.74, the mass ratio of formaldehyde and hydrochloric acid It is 1:20.

[0034] The preparation method of the plugging agent for polymer pollutants provided in this example is as follows:

[0035] Add 276 kg of sodium nitrite and 60 kg of urea to 5m 3 In a reaction kettle, stir uniformly (60 rpm) at a temperature of 20-25°C for 1 hour to form Agent A;

[0036] Add 480 kg of hydrochloric acid and 24 kg of formaldehyde to 5m 3 In a corrosion-resistant reaction kettle, uniformly stir (60 rpm) for 1 hour at a temperature of 20-25°C to form agent B;

[0037] Agent A a...

Embodiment 2

[0045] This embodiment provides a plugging removal agent for polymer pollutants, the raw material composition of the plugging removal agent includes: This embodiment provides a plugging removal agent for polymer pollutants, the plugging removal agent The raw material composition of agent comprises: sodium nitrite (purity 99.5wt%), urea (purity 99.5wt%), industrial hydrochloric acid (concentration is 30wt%), formaldehyde (concentration is 35wt%), potassium chloride (purity 99.5wt%) , wherein the mass ratio of sodium nitrite, urea, and industrial hydrochloric acid is about 1:0.16:1.74, and the mass ratio of formaldehyde to hydrochloric acid is about 1:20.

[0046] The preparation method of the plugging agent for polymer pollutants provided in this example is as follows:

[0047] Add 276 kg of sodium nitrite and 45 kg of urea to 5m 3 In a reaction kettle, stir uniformly (60 rpm) at a temperature of 20-25°C for 1 hour to form Agent A;

[0048] Add 480 kg of hydrochloric acid and...

Embodiment 3

[0057] This embodiment provides a plugging removal agent for polymer pollutants, the raw material composition of the plugging removal agent includes: This embodiment provides a plugging removal agent for polymer pollutants, the plugging removal agent The raw material composition of agent comprises: sodium nitrite (purity 99.5wt%), urea (purity 99.5wt%), industrial hydrochloric acid (concentration is 30wt%), formaldehyde (concentration is 35wt%), potassium chloride (purity 99.5wt%) , wherein the mass ratio of sodium nitrite, urea, and industrial hydrochloric acid is about 1:0.11:1.74, and the mass ratio of formaldehyde to hydrochloric acid is about 1:20.

[0058] The preparation method of the plugging agent for polymer pollutants provided in this example is as follows:

[0059] Add 276 kg of sodium nitrite and 30 kg of urea to 5m 3 In a reaction kettle, stir uniformly (60 rpm) at a temperature of 20-25°C for 1 hour to form Agent A;

[0060] Add 480 kg of hydrochloric acid and...

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PUM

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Abstract

The invention relates to a blocking remover for polymer pollutants. The blocking remover for the polymer pollutants consists of an agent A and an agent B, wherein the agent A consists of sodium nitrite and urea, and the mass ratio of the sodium nitrite to the urea is 1:(0.05-0.4); the agent B consists of formaldehyde and hydrochloric acid, the mass ratio of the formaldehyde to the hydrochloric acid is 1:(5-25), and the concentration of the hydrochloric acid is between 20 and 40 weight percent; and the mass ratio of the sodium nitrite to the hydrochloric acid is 1:(1.5-2). The blocking removerfor inert polymer pollutants can assist in solving the problems of difficulty of injection, poor displacement effect and the like existing in the prior process, has higher injection-increasing amountand longer effective period, can achieve the aim of production increase, and reduce development cost and energy consumption; moreover, the blocking remover has good stability, high safety and broad application prospect.

Description

technical field [0001] The invention relates to a plug-removing agent for oil wells, in particular to a plug-removing agent for polymer pollutants. Background technique [0002] Polymer flooding oil recovery technology is one of the important tertiary oil recovery technologies, and has become the main method of production replacement in the middle and late (high water cut) stages of oilfield development. [0003] As early as 1997, Daqing Oilfield carried out polymer flooding oil recovery test. The large-scale implementation of this technology has played a huge role in the continuous and stable production of Daqing Oilfield. However, as polymer flooding enters into industrialized production, more and more problems have occurred. Many injection wells have problems such as difficult injection and poor displacement effect. The main manifestations are: the injection pressure rises rapidly, and it is difficult to complete according to the ratio Injection injection, or even stop i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52
Inventor 张玉涛马春宝刘晶晶冯永明任从军向延安张瑛韩松刘广友李军郑猛张俊张群柳燕丽于俊梅王亚金徐滨张朝辉赵吉成杨晓莉
Owner PETROCHINA CO LTD