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Organogel blocking agent for water blocking and profile control, and preparation method and application thereof

An organogel, water plugging and profile control technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as inability to meet profile control requirements, low construction success rate, and high biological toxicity of phenolic oligomers , to achieve the effects of improving development benefit and recovery rate, increasing benefit and recovery rate, and good adjustable gelling time

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing two types of polymer gel plugging agent systems still have a large gap with the application requirements of the oil field: the gelation time of the metal ion cross-linked gel at high temperature is short and the thermal stability is poor, and its application range is limited to Low to moderate temperature reservoirs
The gelation time of organic cross-linked gel is too long, which often leads to incomplete gelation in the ground, which affects the plugging effect. At the same time, the biotoxicity of phenolic oligomers is relatively high, and it is easy to spontaneously polymerize when the liquid is mixed on the ground, resulting in successful construction. low rate
Moreover, the thermal stability and salt resistance performance of these two types of polymer gels are far from the requirements of field applications, and cannot meet the requirements of high-temperature deep well water plugging and profile control proposed by oilfields. Therefore, oilfield development needs to have better plugging performance and New polymer blocking agent system with environmental performance

Method used

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  • Organogel blocking agent for water blocking and profile control, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Chemical modification of polymer crosslinking agent: take 40g polyethyleneimine (PEI, M=3.0×10 3 , 30% aqueous solution) was placed in a reaction flask with a condenser, thermometer, stirring bar and addition funnel. While stirring, put 10mL of anhydrous acetic acid into the addition funnel and slowly add it into the reaction flask. After the addition of anhydrous acetic acid is completed, stir the reactant at 60°C to 70°C for 3 hours, cool to room temperature, take it out, and use 50% sodium hydroxide solution to adjust the pH of the solution to 7.0. Adjust the concentration of PEI in the product to 12% with water to obtain polymer modified cross-linking agent PEI-A 1#.

[0033] (2) Preparation of polymer organogel plugging agent solution: take 1.25g polyacrylamide (M=8.0×10 6 , degree of hydrolysis 3%) add 90g of water, stir for 4 hours until the polyacrylamide is completely dissolved, then add 2.5g of the polymer modified cross-linking agent PEI-A 1#, 0.25g of ...

Embodiment 2

[0047] (1) Chemical modification of polymer crosslinking agent: take 40g polyethyleneimine (PEI, M=1.5×10 4 , 35% aqueous solution) was placed in a reaction flask with a condenser, thermometer, stirring bar and addition funnel. While stirring, put 10mL of anhydrous acetic acid into the addition funnel and slowly add it into the reaction flask. After the addition of anhydrous acetic acid is completed, stir the reactant at 60°C to 70°C for 3 hours, cool to room temperature, take it out, and use 50% sodium hydroxide solution to adjust the pH of the solution to 7.0. Adjust the concentration of PEI in the product to 12% with water to obtain the polymer modified cross-linking agent PEI-A 2#.

[0048] (2) Polymer organogel plugging agent solution preparation: get 0.6g acrylamide / tert-butyl acrylate copolymer (containing 95% acrylamide and 5% tert-butyl acrylate in the copolymer, M=6.0×10 6 , degree of hydrolysis 3%), add 90g water, stir for 4 hours until the polyacrylamide is compl...

Embodiment 3

[0057] (1) Preparation of polymer organogel plugging agent solution: take 0.2g polyacrylamide (M=1.2×10 7 , degree of hydrolysis 10%), add 90g of water, stir for 4 hours until the polyacrylamide is completely dissolved, then add 0.4g of polymer modified cross-linking agent PEI-A 2#, 0.2g of sodium bicarbonate, make up the total mass of the solution to 100g with water, Stir well and set aside.

[0058] (3) Gelling time and thermal stability test:

[0059] After the polymer organogel plugging agent solution is prepared, put the solution into three vials, press the caps and seal them, put them in an oven at 90°C, observe and record the gelation time, take out a bottle after standing for 10 days, and open it to measure the gel viscosity. Elasticity, the remaining 2 bottles were placed in the oven for 90 days, and the "visual code evaluation method" commonly used in the petroleum industry was used to evaluate and record the change of gel strength within 90 days. The results are sh...

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Abstract

The invention relates to an organogel blocking agent for water blocking and profile control, and a preparation method and application thereof. The blocking agent consists of the following substances: 0.2 to 1.5 weight percent of polymer thickening agent, 0.2 to 3.0 weight percent of macromolecular modified crosslinking agent, 0.2 to 1.5 weight percent of pH regulator and the balance of water. The polymer thickening agent is selected from polymers of ethylene unsaturated polar monomers and ethylene unsaturated esters, and has the molecular weight of 5.0*10<5>-1.5*10<7>; the macromolecular modified crosslinking agent is selected from carboxylic acid derivatives of water-soluble amino functional group-containing polymer, and has the molecular weight of 3.0*10<3>-8.0*10<4>; and the pH regulator is alkali carbonate. The blocking agent is suitable for construction such as oilfield water blocking and profile control, deep profile modification and the like, has selective blocking capacity and adjustable gelling time, is easy and convenient to use, and has important significance for efficiently developing oilfields of China and stabilizing oil and reducing water.

Description

technical field [0001] The invention relates to a plugging agent for oil fields, in particular to a novel organic gel plugging agent for oil fields, a preparation method and application thereof. Background technique [0002] Most of my country's onshore oilfields have entered the stage of high water cut development, and the comprehensive water cut of oil well production fluid is often above 90%, and the efficiency of water flooding is very low. At the same time, the separation and treatment of water in the produced fluid will generate huge economic costs. According to statistics, the world petroleum industry spends about 4.5×10 per year to deal with excess water production. 10 Dollar. Therefore, in order to increase oil production and reduce water production, water plugging and profile control technology came into being. [0003] At present, the most commonly used water plugging and profile control technology in oil fields is chemical water plugging and profile control te...

Claims

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Application Information

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IPC IPC(8): C09K8/42
Inventor 赵梦云
Owner CHINA PETROLEUM & CHEM CORP
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