An environmentally friendly delayed cross-linking profile control agent for oil recovery, its preparation method and use

A delayed cross-linking and profile control agent technology, which is applied in chemical instruments and methods, production fluids, earthwork drilling and production, etc., can solve the problems that cannot meet the profile control requirements of low-permeability fractured formations, reduce oil recovery, and fail to reach sealing Problems such as plugging cracks, achieving the effect of good industrialization potential

Active Publication Date: 2021-06-11
DONGYING FANGLI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the disadvantages that the strength of the existing control and displacement agents decreases greatly after being sheared in the near-well zone of the water well, and cannot meet the requirements of sealing fractures and profile control of low-permeability fracture formations.
[0023] As mentioned above, a variety of profile control agents that can be used in the field of oil exploration and development are disclosed in the prior art, but there is still a need for continuous improvement in the profile control effect, and in the face of the increasing complexity of the geological conditions of the oil well and the oil recovery rate The reality of the increasingly declining situation, there is also an urgent demand for new profile control agents

Method used

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  • An environmentally friendly delayed cross-linking profile control agent for oil recovery, its preparation method and use
  • An environmentally friendly delayed cross-linking profile control agent for oil recovery, its preparation method and use
  • An environmentally friendly delayed cross-linking profile control agent for oil recovery, its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1: Preparation of delayed cross-linking profile control agent for environment-friendly oil recovery

[0054] S1: Synthesis of salt-resistant polymer solution, specifically:

[0055] In parts by weight, add 18 parts of acrylamide, 5 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.5 parts of N,N-dimethyl- Hexadecyl allyl ammonium chloride and 0.05 part of sodium formate, stir well, then slowly add the ternary composite initiator (in parts by weight, 0.2 part of tetramethylethylenediamine, 0.1 part of ammonium persulfate and 0.025 a mixture of sodium sulfite), and continue to react at a constant temperature of 10°C for 3 hours to obtain the salt-resistant polymer solution;

[0056] S2: hydrolyzing the salt-resistant polymer solution to obtain a hydrolyzate, specifically:

[0057] At a constant temperature of 40°C, add an appropriate amount of sodium carbonate to the salt-resistant polymer solution, so that the number-average molecular weight of the salt-res...

Embodiment 2

[0062] Example 2: Preparation of delayed cross-linking profile control agent for environment-friendly oil recovery

[0063] S1: Synthesis of salt-resistant polymer solution, specifically:

[0064] In parts by weight, add 20 parts of acrylamide, 3 parts of 2-acrylamido-2-methylpropanesulfonic acid, 1 part of N,N-dimethyl- Hexadecyl allyl ammonium chloride and 0.05 part of sodium formate, stir well, then slowly add the ternary composite initiator (in parts by weight, 0.4 part of tetramethylethylenediamine, 0.05 part of ammonium persulfate and 0.05 part Parts of sodium sulfite mixture), and continue to react at a constant temperature of 12 ° C for 2 hours to obtain the salt-resistant polymer solution;

[0065] S2: hydrolyzing the salt-resistant polymer solution to obtain a hydrolyzate, specifically:

[0066] At a constant temperature of 50°C, add an appropriate amount of sodium carbonate to the salt-resistant polymer solution, so that the number-average molecular weight of the ...

Embodiment 3

[0071] Embodiment 3: Preparation of delayed cross-linking profile control agent for environment-friendly oil recovery

[0072] S1: Synthesis of salt-resistant polymer solution, specifically:

[0073] In parts by weight, add 19 parts of acrylamide, 4 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.75 parts of N,N-dimethyl- Hexadecyl allyl ammonium chloride and 0.05 part of sodium formate, stir well, then slowly add the ternary composite initiator (in parts by weight, 0.3 part of tetramethylethylenediamine, 0.075 part of ammonium persulfate and 0.038 Parts of sodium sulfite mixture), and continue to react at a constant temperature of 11 ° C for 2.5 hours to obtain the salt-resistant polymer solution;

[0074] S2: hydrolyzing the salt-resistant polymer solution to obtain a hydrolyzate, specifically:

[0075] At a constant temperature of 45°C, add an appropriate amount of sodium carbonate to the salt-resistant polymer solution, so that the number-average molecular weight o...

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Abstract

The invention relates to a preparation method of an environment-friendly delayed crosslinking profile control agent for oil recovery. The preparation method comprises the following steps: S1: synthesizing a salt-resistant polymer solution; S2: hydrolyzing the salt-resistant polymer solution to obtain a hydrolyzed solution; S3: Treat the hydrolyzate to obtain the salt-resistant polymer; S4: Add the salt-resistant polymer, phenolic compound, aldehyde compound and catalyst into the deionized water at room temperature, stir and mix evenly, and obtain the environmentally friendly oil recovery retarder Cross-linking profile control agent. It also relates to an environment-friendly delayed cross-linking profile control agent for oil recovery obtained by the above preparation method and its application in oil recovery. The environmentally friendly delayed cross-linking profile control agent for oil recovery has many excellent properties such as excellent thermal stability, plugging performance, high temperature resistance, viscosity increasing performance and high salinity resistance, so it can be applied in oil production. To achieve various profile control effects, it has good application prospects and production potential in the field of oil extraction technology.

Description

technical field [0001] The present invention relates to a profile control agent used to increase oil production and recovery in oilfield exploitation and development, as well as its preparation method and use, more particularly to an environmentally friendly delayed cross-linking profile control agent for oil recovery, its preparation method and use The invention belongs to the technical field of petroleum extraction additives. Background technique [0002] At present, my country's old water-flooding oilfields generally enter the high water-cut or even ultra-high water-cut production period. Long-term water flooding scours lead to inefficient or ineffective circulation of injected water along the dominant water flow channels or high-permeability strips, seriously affecting water flooding development. Effects and overall benefits, leading to lower yields, lower benefits, and an increasing impact on the environment. [0003] In order to solve this problem, people have develope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/88E21B43/22C08F220/56C08F220/58C08F226/02C08F8/12C08G8/04
Inventor 周自阳张传干王立文
Owner DONGYING FANGLI CHEM CO LTD
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