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Water plugging agent and preparation method thereof

A technology of water blocking agent and phase inversion agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the problem of water blocking agent glue forming difficulty, low gel blocking strength, weak gel adsorption, etc. problems, to achieve the effect of increasing the difficulty of construction, improving rigidity, and improving adsorption.

Active Publication Date: 2021-06-25
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the current profile control and water plugging technology. For example, it is difficult for the water blocking agent glue to form a gel under the condition of high temperature and high salinity formation, the gel plugging strength is low, and the gel has weak adsorption in the formation. Erosion resistance, etc.

Method used

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  • Water plugging agent and preparation method thereof
  • Water plugging agent and preparation method thereof
  • Water plugging agent and preparation method thereof

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preparation example Construction

[0038] The present invention provides the preparation method of the water shutoff agent described in the first aspect of the present invention in the second aspect, the method comprises the following steps:

[0039] (a) uniformly mixing acrylamide, strength monomer, high adhesion promoting monomer, micro-crosslinking agent, associative thickener, responsive monomer, associative monomer and water to obtain an aqueous phase solution;

[0040] (b) mixing the oily solvent, emulsifier, co-emulsifier and polymerization stabilizer uniformly to obtain an oil phase solution;

[0041] (c) adding the water phase solution, azo initiator and oxidizing agent into the oil phase solution and mixing uniformly to obtain an emulsion solution;

[0042] (d) Adjust the temperature of the milky solution to 10-25°C (for example, 10°C, 15°C, 20°C or 25°C), pass nitrogen to remove oxygen, then add a reducing agent to initiate polymerization, and then heat preservation treatment to obtain Polymerizatio...

Embodiment 1

[0056] The water blocking agent in the present embodiment is made up of the following components by weight:

[0057] 100 parts of acrylamide, 20 parts of 2-acrylamido-2-methylpropanesulfonic acid (strength monomer), 40 parts of N-vinylpyrrolidone (strength monomer), urea methacrylate (high adhesion promoting monomer) body) 10 parts, N,N-methylenebisacrylamide (micro-crosslinking agent) 0.01 part, RM-8W (associative thickener) 1 part, N,N-dimethylacrylamide (response Body) 40 parts, methacrylamide stearyl alcohol polyoxyethylene ether (associated monomer) 2 parts, potassium hydroxide 5 parts, water 400 parts, white oil 200 parts, Span 60 (Span series emulsifier ) 15 parts, Tween 40 (Tween series emulsifier) ​​5 parts, n-butanol (co-emulsifier) ​​2 parts, DOWFAX 8390 (polymerization stabilizer) 1 part, azobisisobutyronitrile 0.2 parts, ammonium persulfate (oxidizing agent) 0.03 parts, sodium bisulfite (reducing agent) 0.05 parts, fatty alcohol polyoxyethylene ether (phase inver...

Embodiment 2

[0065] The water blocking agent in the present embodiment is made up of the following components by weight:

[0066] Acrylamide 110 parts, N-vinylpyrrolidone (strength monomer) 40 parts, N-vinyl formamide (strength monomer) 40 parts, methacrylamide ethyl ethylene urea (high adhesion promoting monomer) 15 parts Parts, 0.05 parts of pentaerythritol triallyl ether (micro-crosslinking agent), 2 parts of RM-8W (associative thickener), 60 parts of N,N-diethylacrylamide (responsive monomer), N- 4 parts of phenethyl-N-tetradecyl methacrylamide (associated monomer), 0.2 parts of potassium hydroxide, 350 parts of water, 240 parts of white oil, 21 parts of Span 80 (Span series emulsifier) , Tween 60 (Tween series emulsifier) ​​9 parts, hexanol (co-emulsifier) ​​3 parts, DOWFAX 8390 (polymerization stabilizer) 3 parts, azobisisoheptanonitrile 0.3 parts, ammonium persulfate (oxidant) 0.03 0.05 part of sodium bisulfite (reducing agent), 30 parts of fatty alcohol polyoxyethylene ether (phas...

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Abstract

The invention relates to a water plugging agent and a preparation method thereof. The water plugging agent comprises the following components in parts by weight: 100 to 120 parts of acrylamide, 60 to 100 parts of a strength monomer, 10 to 20 parts of a high-adhesion promoting monomer, 0.01 to 0.1 part of a micro-crosslinking agent, 1 to 4 parts of an associative thickener, 40 to 80 parts of a response monomer, 2 to 6 parts of an associative monomer, 0 to 27 parts of potassium hydroxide, 320 to 400 parts of water, 200 to 280 parts of an oily solvent, 20 to 40 parts of an emulsifier, 2 to 5 parts of a co-emulsifier, 1 to 5 parts of a polymerization stabilizer, 0.02 to 0.5 part of an initiator and 25 to 35 parts of a phase inversion agent. The water plugging agent disclosed by the invention is of a micro-crosslinking association network structure, mainly adopts intermolecular crosslinking, has dense grid holes, thick molecular chains, strong water molecule wrapping capacity, more stable gel and lower dehydration rate, can effectively reduce the permeability of a rock core, and has a good plugging effect.

Description

technical field [0001] The invention relates to the technical field of oilfield production increasing additives, in particular to a water shutoff agent and a preparation method thereof. Background technique [0002] With the continuous development of oilfields, water production from oil wells has long been a common problem in the development process. Interlayer and intralayer plane contradictions are prominent, and heterogeneity is enhanced, resulting in the formation of dominant channels for water flow in the formation, and even water cones or water wells. This will cause premature water breakthrough or water flooding in some oil wells, low water flooding efficiency or ineffective circulation, and low ultimate recovery. [0003] In order to solve the above problems, the profile control and water shutoff technology of oil layers has gradually been paid attention to and developed in oil field development. Profile control and water plugging are used to increase the sweep coef...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F226/10C08F222/38C08F220/54C08F220/58C08F226/02C08F230/02C08F220/38C08F216/12C08F220/60C08F220/36C09K8/512C09K8/88
CPCC08F220/56C09K8/512C09K8/5083C09K8/887C09K8/882C08F220/585C08F226/10C08F222/385C08F220/54C08F220/58C08F226/02C08F230/02C08F220/382C08F216/125C08F220/603C08F220/36
Inventor 荣敏杰孙建波许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH
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