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CO2 response in-situ gel channeling sealing agent as well as preparation method and application thereof

A technology of sealing channeling agent and gel, applied in chemical instruments and methods, drilling composition and other directions, can solve the problem of not effectively solving the problem of gas channeling in oil reservoir drive, no breakthrough progress, and poor thickening effect and other problems, to achieve the effect of controlling and inhibiting or preventing gas channeling, simple components, and expanding the swept volume of gas flooding

Active Publication Date: 2018-01-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to thickeners such as conventional polymers and surfactants in CO 2 insoluble or require large amounts of co-solvent to thicken, thus resulting in CO 2 thickening effect is not good, moreover, CO 2 Viscosification is difficult and costly. In recent years, CO 2 There is no breakthrough in the research ideas of thickening and anti-channeling methods
[0007] None of the current channel sealing technologies mentioned above can effectively solve the problem of CO2 in the reservoir. 2 gas channeling problem, therefore, it is imperative to find a new channeling sealing system

Method used

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  • CO2 response in-situ gel channeling sealing agent as well as preparation method and application thereof
  • CO2 response in-situ gel channeling sealing agent as well as preparation method and application thereof
  • CO2 response in-situ gel channeling sealing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a CO 2 In response to the preparation method of in-situ gel blocking agent, it may further comprise the steps:

[0040] Step 1: Mix hexamethylenetetramine and resorcinol at a mass ratio of 1:0.5, then stir evenly at room temperature to generate CO with a mass fraction of 0.09%. 2 Responsive crosslinking agent solution, the solvent is water, the specific reaction principle is as follows:

[0041]

[0042] Step 2: Slowly add a certain amount of hydrophobically modified polyacrylamide into the stirring water, and after fully dissolving, add the CO prepared in step 1 in proportion 2 Responsive crosslinker solution, stir well until well mixed to form CO 2 Response to gel blocker solutions, where CO 2 Response to the total mass of the gel blocking agent solution, CO 2 The content of the responsive crosslinking agent is 0.09%, the dosage of the hydrophobically modified polyacrylamide is 1%, and the solvent is water.

[0043] CO produced in this...

Embodiment 2

[0050] This embodiment provides a CO 2 In response to the preparation method of in-situ gel blocking agent, it may further comprise the steps:

[0051] Step 1: Mix hexamethylenetetramine and resorcinol at a mass ratio of 1:0.5, then stir evenly at room temperature to generate CO with a mass fraction of 0.09%. 2 Responsive crosslinking agent solution, the solvent is water;

[0052] Step 2: Slowly add a certain amount of hydrophobically modified polyacrylamide into the stirring water, and after fully dissolving, add the CO prepared in step 1 in proportion 2 Responsive crosslinker solution, stir well until well mixed to form CO 2 Response to gel blocker solutions, where CO 2 Response to the total mass of the gel blocking agent solution, CO 2 The content of the responsive crosslinking agent is 0.09%, the dosage of the hydrophobically modified polyacrylamide is 0.7%, and the solvent is water.

[0053] CO produced in this example 2 Tested in response to the gel performance of ...

Embodiment 3

[0059] This embodiment provides a CO 2 In response to the preparation method of in-situ gel blocking agent, it may further comprise the steps:

[0060] Step 1: Mix hexamethylenetetramine and resorcinol at a mass ratio of 1:0.5, then stir evenly at room temperature to generate CO with a mass fraction of 0.09%. 2 Responsive crosslinking agent solution, the solvent is water;

[0061] Step 2: Slowly add a certain amount of hydrophobically modified polyacrylamide into the stirring water, and after fully dissolving, add the CO prepared in step 1 in proportion 2 Responsive crosslinker solution, stir well until well mixed to form CO 2 Response to gel blocker solutions, where CO 2 Response to the total mass of the gel blocking agent solution, CO 2 The content of the responsive crosslinking agent is 0.09%, the dosage of the hydrophobically modified polyacrylamide is 1.5%, and the solvent is water.

[0062] CO produced in this example 2 Tested in response to the gel performance of ...

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Abstract

The invention provides a CO2 response in-situ gel channeling sealing agent as well as a preparation method and an application thereof. The CO2 response in-situ gel channeling sealing agent is preparedfrom components in percentage by mass as follows: 0.02%-0.2% of a crosslinking agent, 0.2%-2.0% of hydrophobically modified polyacrylamide and the balance of water, wherein the crosslinking agent iscompounded from a polyamine compound and a phenol compound in a mass ratio being (0.5-3):0.5. The CO2 response in-situ gel channeling sealing agent can be subjected to a crosslinking reaction with CO2in an oil field with the formation temperature ranging from room temperature to 90 DEG C, and channeling sealing gel can be formed just 1-3 days after crosslinking and can serve as the channeling sealing agent or a profile adjusting / water plugging agent in oilfield exploitation.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation and relates to a CO 2 Response-in-situ gel blocking agent and its preparation method and application. Background technique [0002] Currently, CO 2 Flooding has become an effective development method for low-permeability / ultra-low-permeability oilfields, but gas channeling restricts CO 2 full play of the driving effect. Severe heterogeneity and natural / artificial fractures in low-permeability / ultra-low-permeability reservoirs further aggravate gas channeling and seriously reduce the displacement effect. Controlling and inhibiting or preventing gas channeling, and expanding the swept volume of gas flooding are important for improving CO in low-permeability / ultra-low-permeability oilfields. 2 The effect of drive development is of great significance. At present, the gas channeling prevention and sealing technologies at home and abroad are all from the improvement of CO 2 The fluidity of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/594C09K8/512
Inventor 唐孝芬熊春明曾致翚魏发林邵黎明刘平德吕静
Owner PETROCHINA CO LTD
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