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Environment-friendly oil production delayed cross-linking profile control agent, method for preparing same and application of environment-friendly oil production delayed cross-linking profile control agent

A delayed cross-linking and environment-friendly technology, applied in chemical instruments and methods, production fluids, earthwork drilling and production, etc., can solve problems such as inability to meet the profile control requirements of low-permeability fractured formations, reduced oil recovery, and reduced strength. Achieve the effects of good application prospects and production potential, good industrialization potential, and excellent thermal stability

Active Publication Date: 2019-05-10
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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  • Environment-friendly oil production delayed cross-linking profile control agent, method for preparing same and application of environment-friendly oil production delayed cross-linking profile control agent
  • Environment-friendly oil production delayed cross-linking profile control agent, method for preparing same and application of environment-friendly oil production delayed cross-linking profile control agent
  • Environment-friendly oil production delayed cross-linking profile control agent, method for preparing same and application of environment-friendly oil production delayed cross-linking profile control agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0055] In parts by weight, at a constant temperature of 10°C, 18 parts of acrylamide, 5 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.5 parts of N,N-dimethyl- Cetyl 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 part of ammonium persulfate Part of sodium sulfite mixture), 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, an appropriate amount of sodium carbonate is added to the salt-resistant polymer ...

Embodiment 2

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

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

[0064] In parts by weight, at a constant temperature of 12 °C, to 100 parts of deionized water, add 20 parts of acrylamide, 3 parts of 2-acrylamido-2-methylpropanesulfonic acid, 1 part of N,N-dimethyl- Cetyl 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 of ammonium persulfate 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, an appropriate amount of sodium carbonate is ...

Embodiment 3

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

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

[0073] In parts by weight, at a constant temperature of 11 °C, to 100 parts of deionized water, add 19 parts of acrylamide, 4 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.75 parts of N,N-dimethyl- Cetyl allyl ammonium chloride and 0.05 part of sodium formate, stir well, and 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 part of ammonium persulfate) Part 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, an appropriate amount of sodium c...

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Abstract

The invention relates to a method for preparing an environment-friendly oil production delayed cross-linking profile control agent. The method includes steps of S1, synthesizing anti-salt polymer solution; S2, hydrolyzing the anti-salt polymer solution to obtain hydrolysate; S3, treating the hydrolysate to obtain anti-salt polymers; S4, adding the anti-salt polymers, phenol compounds, aldehyde compounds and catalysts into deionized water at the normal temperature and uniformly stirring and mixing the anti-salt polymers, the phenol compounds, the aldehyde compounds, the catalysts and the deionized water with one another to obtain the environment-friendly oil production delayed cross-linking profile control agent. The invention further relates to the environment-friendly oil production delayed cross-linking profile control agent prepared by the aid of the method and application of the environment-friendly oil production delayed cross-linking profile control agent to petroleum exploitation. The method, the environment-friendly oil production delayed cross-linking profile control agent and the application have the advantages that the environment-friendly oil production delayed cross-linking profile control agent is excellent in diversified properties such as the heat stability, the plugging performance, the high-temperature resistance, the viscosity increasing performance and the high mineralization resistance and accordingly can be applied to petroleum exploitation, diversified profile control effects can be realized by the environment-friendly oil production delayed cross-linking profile control agent, and the method and the environment-friendly oil production delayed cross-linking profile control agent has excellent application prospects and production potential in the technical field of petroleum exploitation.

Description

technical field [0001] The invention relates to a profile control agent used for improving oil production and recovery in oilfield exploitation and development, a preparation method and application thereof, and more particularly to an environment-friendly delayed cross-linking profile control agent for oil extraction, preparation method and application thereof , which belongs to the technical field of petroleum exploitation aids. Background technique [0002] At present, the old water-flooding oilfields in my country generally enter a period of high water-cut or even ultra-high water-cut production. Long-term water flooding causes the injected water to circulate inefficiently or ineffectively along the dominant water flow channels or high-permeability strips, which seriously affects the development of water flooding. Effects and overall benefits, resulting in lower yields, lower benefits, and an increasing impact on the environment. [0003] In order to solve this problem, p...

Claims

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Application Information

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Patent Type & Authority Applications(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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