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Low-cost high-temperature high-salt oil reservoir binary composite oil displacement system and preparation method

A binary compound flooding, high temperature and high salt technology, applied in the field of oil recovery and flooding, can solve the problems of poor salt resistance and high cost

Inactive Publication Date: 2021-04-23
TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a low-cost, high-temperature, high-salt reservoir binary compound flooding system and a preparation method, which solves the problem of temperature resistance and anti-corrosion of polymers and surfactants used in oil field production. Problems of poor salt and high cost

Method used

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Effect test

Embodiment 1

[0030] The embodiment of the present invention provides a low-cost high-temperature and high-salt reservoir binary compound oil displacement system, which includes the following components: micro-crosslinked temperature-resistant and salt-resistant polymer 0.15%, emulsifying thickening surfactant 0.05%, the balance for tap water.

[0031] The micro-crosslinked temperature-resistant and salt-resistant polymer comprises the following components in parts by weight: 200g of acrylamide, 25g of 2-acrylamide-2-methylpropanesulfonic acid, 8g of N-vinylpyrrolidone, 3g of morpholine amide, 30g of sodium acrylate, 740g of pure water.

[0032] Wherein the slightly cross-linked temperature-resistant and salt-resistant polymer comprises the following preparation steps:

[0033] S1. Add 640g of pure water into the jar according to the ratio, and then add acrylamide and 2-acrylamide-2-methylpropanesulfonic acid to dissolve them evenly to obtain a mixed solution;

[0034] S2. Take another ja...

Embodiment 2

[0048] The embodiment of the present invention provides a low-cost high-temperature and high-salt reservoir binary compound oil displacement system, which includes the following components: micro-crosslinked temperature-resistant and salt-resistant polymer 0.15%, emulsifying thickening surfactant 0.1%, the balance for tap water.

[0049] The micro-crosslinked temperature-resistant and salt-resistant polymer comprises the following components by weight: 200g of acrylamide, 25g of 2-acrylamide-2-methylpropanesulfonic acid, 8g of N-vinylpyrrolidone, 3g of morpholine amide, and 30g of sodium acrylate , 740 parts of pure water.

[0050] Wherein the slightly cross-linked temperature-resistant and salt-resistant polymer comprises the following preparation steps:

[0051] S1. According to the proportional relationship, add 640 pure water into the jar, and then add acrylamide and 2-acrylamide-2-methylpropanesulfonic acid to dissolve it evenly to obtain a mixed solution;

[0052] S2. ...

Embodiment 3

[0066] The embodiment of the present invention provides a low-cost high-temperature and high-salt reservoir binary compound oil displacement system, which includes the following components: micro-crosslinked temperature-resistant and salt-resistant polymer 0.3%, emulsifying thickening surfactant 0.2%, the balance for tap water.

[0067] The micro-crosslinked temperature-resistant and salt-resistant polymer comprises the following components in parts by weight: 200g of acrylamide, 25g of 2-acrylamide-2-methylpropanesulfonic acid, 8g of N-vinylpyrrolidone, 3g of morpholine amide, 30g of sodium acrylate, 740g of pure water.

[0068] Wherein the slightly cross-linked temperature-resistant and salt-resistant polymer comprises the following preparation steps:

[0069] S1. According to the proportional relationship, add 640 pure water into the jar, and then add acrylamide and 2-acrylamide-2-methylpropanesulfonic acid to dissolve it evenly to obtain a mixed solution;

[0070] S2. Ta...

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Abstract

The invention provides a low-cost high-temperature high-salt oil reservoir binary composite oil displacement system and a preparation method, and relates to the technical field of oil extraction and oil displacement. The low-cost high-temperature high-salt oil reservoir binary composite oil displacement system is prepared from the following components: 0.15-0.3% of a micro-crosslinking temperature-resistant and salt-resistant polymer, 0.05-0.2% of an emulsifying thickening surfactant and the balance of tap water. The micro-crosslinking temperature-resistant and salt-resistant polymer is prepared from the following components in parts by weight: 190-210 parts of acrylamide, 25-30 parts of 2-acrylamide-2-methyl propanesulfonic acid, 7-8 parts of N-vinyl pyrrolidone, 3-4 parts of morpholine amide, 30-35 parts of sodium acrylate and 700-750 parts of pure water. The polymer and surfactant binary system forms an oil displacement system with better temperature resistance and salt resistance and ultralow interfacial activity through the matching of the micro-crosslinking temperature-resistant and salt-resistant polymer and the emulsifying thickening surfactant, and the viscosity stability of the system can still reach 90% or above after 90 days.

Description

technical field [0001] The invention relates to the technical field of oil production and flooding, in particular to a low-cost, high-temperature, high-salt oil reservoir binary compound flooding system and a preparation method. Background technique [0002] With the deepening of the exploitation of old oilfields, the oil production formations are getting deeper and deeper, and the geological reserves of high-temperature and high-salt oil reservoirs with a formation temperature of about 100 °C are large, and they are faced with development difficulties such as rapid water cut rise, large production decline, and weak production stability foundation. In ultra-high water-cut areas, it is difficult to effectively improve the development effect by relying on conventional secondary development. Polymer / emulsion-thickening surfactant composite flooding technology can be used to effectively block high-permeability layers and activate low-permeability layers to divert liquid flow. Vi...

Claims

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Application Information

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IPC IPC(8): C09K8/588C09K8/584C08F220/56C08F220/58C08F226/10C08F220/06C08F220/34
CPCC09K8/588C09K8/584C08F220/56C08F220/585C08F226/10C08F220/06C08F220/34
Inventor 安丽媛周传臣王志宏葛红江冯红岩刘颖陈颖程静杨明莉张婧王欢高磊刘旻谢萍王雪
Owner TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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