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Deep coating composite gel modifying and flooding agent for oil recovery and preparation method of deep coating composite gel modifying and flooding agent

A composite gel and displacement control agent technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high temperature resistance, poor salt resistance, and uncontrollable gelation time of profile control agents, etc. The method is simple, has good application prospects, and has the effect of enhancing oil recovery

Inactive Publication Date: 2015-02-25
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

[0003] The technical problem to be solved in the present invention is that the gelling time of the profile control agent in the prior art is uncontrollable, and the high temperature resistance and salt resistance are poor. It provides a deep coating composite gel control and displacement agent for oil recovery and its preparation method. Suitable for deep control and flooding of various oil reservoirs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh acrylamide and N-hydroxyethylacrylamide at a molar ratio of 10:1, dissolve in water, heat to 90°C, and polymerize under the trigger of potassium persulfate to obtain a composite copolymer, which is obtained by adding methanol and filtering; Lotropine and resorcinol were accurately weighed in a molar ratio of 10:1, and then distilled water was added to obtain a phenolic crosslinking agent for later use; after 1 part of composite polymer was dissolved in 98.4 parts of water, 0.5 part of phenolic crosslinking agent was added, and after mixing Heating at 65-80 degrees, reacting for 40-60 minutes, adding 1 part of pH regulator acetic acid to adjust the pH to 6, and obtaining the control agent sample 1; the gelation time at 90°C is 5 hours, the gel viscosity is 4200mPa·s The glue temperature was 103°C, and plugging and oil displacement experiments were carried out on cores with a permeability of 100-120mD. The plugging rate was 90.1%, and the recovery rate was 2.9%.

Embodiment 2

[0017] Weigh acrylamide and N-hydroxyethylacrylamide at a molar ratio of 10:1, dissolve in water, heat to 90°C, and polymerize under the trigger of potassium persulfate to obtain a composite copolymer, which is obtained by adding methanol and filtering; After 1 part of composite polymer is dissolved in 98.4 parts of water, add 0.5 part of aluminum citrate cross-linking agent, mix and heat at 65-80 degrees, react for 40-60 minutes, add 1 part of pH regulator acetic acid to adjust the pH to 6, and get the conditioner Agent sample 2; the gelling time at 90°C is 4 hours, the gel viscosity is 5100mPa·s, the gel breaking temperature is 110°C, the plugging and oil displacement experiments are carried out on rock cores with a permeability of 100-120mD, and the plugging rate is 91.1%, enhanced oil recovery 3.1%.

Embodiment 3

[0019] Weigh acrylamide and N-hydroxyethylacrylamide at a molar ratio of 10:1, dissolve in water, heat to 90°C, and polymerize under the trigger of potassium persulfate to obtain a composite copolymer, which is obtained by adding methanol and filtering; Lotropine and resorcinol were accurately weighed in a molar ratio of 10:1, and then distilled water was added to obtain a phenolic crosslinking agent for subsequent use; after 1 part of composite polymer was dissolved in 98.4 parts of water, 0.5 part of composite crosslinking agent, citric acid The mass ratio of aluminum to phenolic cross-linking agent is 4:1. After mixing, heat at 65-80 degrees, react for 40-60 minutes, add 1 part of pH regulator acetic acid to adjust the pH to 6, and obtain the driving agent sample 3; The gel forming time is 6 hours, the gel viscosity is 5500mPa·s, and the gel breaking temperature is 150°C. The plugging and oil displacement experiments are carried out on the core with a permeability of 100-120...

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Abstract

The invention provides a deep coating composite gel modifying and flooding agent for oil recovery, which is characterized by comprising the following components in percentage by weight: 0.5-5% of a composite polymer, 0.1-5% of a cross-linking agent, 0.05-2% of a pH regulator and the balance of water. A preparation method of the deep coating composite gel modifying and flooding agent for oil recovery comprises the following steps: dissolving the composite polymer in water, adding the cross-linking agent, mixing, heating to 65-80 DEG C, reacting for 40-60min, and adding the pH regulator to regulate pH to 4-7. The deep coating composite gel modifying and flooding agent for oil recovery, disclosed by the invention, is suitable for various environments; the preparation method is simple; the gel forming time is adjustable; the deep coating composite gel modifying and flooding agent has excellent injectivity, shearing resistance, heat stability and plugging performance, is suitable for modifying and flooding operation of an injection well, and has excellent application prospect in term of stabilizing oil production and controlling water cut for enhancing oil recovery in later development of a high water-cut oilfield.

Description

technical field [0001] The invention relates to the field of additives for the petroleum industry, in particular to a deep coating composite gel regulating and displacing agent for oil recovery and a preparation method thereof. Background technique [0002] As the oilfield enters the late stage of medium and high water cut development, it becomes more and more difficult to stabilize oil and control water. How to further improve the volumetric sweep coefficient of injected water and the displacement efficiency within the water sweep volume is one of the major issues to be solved urgently in the petroleum industry. one. Due to the long-term scouring effect of injected water, coupled with the influence of reservoir depositional environment and heterogeneity, the contradictions between layers and planes have become more and more prominent, and water flow channels have formed between oil and water wells, making it difficult to produce well in low-permeability layers , so that a ...

Claims

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Application Information

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IPC IPC(8): C09K8/588
CPCC09K8/588
Inventor 胡玉国梁海臣李靖张冠洲张有强张凤跃肖劲松孙红桃李东
Owner TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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