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Polymer gel composite plugging agent and preparation method thereof

A technology of polymer gel and plugging agent, which is applied in chemical instruments and methods, drilling composition and other directions, can solve the problems that the plugging agent cannot be formed, the fluid is too much, and the temperature is high, and the hydrodynamic volume increases, The effect of lively nature and increased viscosity

Pending Publication Date: 2020-05-12
刘小龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the reasons for lost circulation is that there are natural loss channels in the drilled formations, such as high permeability formations, fractured formations, and cavernous formations. In this case, we generally choose to use plugging agents to stop lost circulation. There will be a lot of fluid and high temperature in the cracks to a large extent. When the conventional plugging agent is used, the plugging agent cannot be formed due to excessive fluid washing or high temperature, which brings us inconvenience.

Method used

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  • Polymer gel composite plugging agent and preparation method thereof
  • Polymer gel composite plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] S1: Prepare materials:

[0042] Weigh diallylmethylamine, hexadecane bromide, absolute ethanol, 2-acrylamide-2-methylpropanesulfonic acid, polypropylene amine, sodium bisulfite, potassium persulfate, polyethylene glycol, Sodium p-styrene sulfonate, bentonite, diethylene glycol vinyl ether and anhydrous sodium sulfite, spare;

[0043] Take by weighing EVA hot melt adhesive, xylene, maleic anhydride, initiator, ethanol precipitation agent, rosin glyceride, antioxidant and regulator, for subsequent use;

[0044] S2: Preparation of modified microspheres:

[0045] Preparation of additives: Take 2-acrylamide-2-methylpropanesulfonic acid, dissolve in distilled water, heat to 40-50°C, stir for 15-25min, then add polyethylene glycol, sodium p-styrenesulfonate and bentonite in sequence , continue to stir for 20-30min, then add diethylene glycol vinyl ether, potassium persulfate and anhydrous sodium sulfite in turn, continue to stir for 30-40min, slowly heat up to 65-70°C, react...

Embodiment 2

[0057] S1: Prepare materials:

[0058] Weigh diallylmethylamine, hexadecane bromide, absolute ethanol, 2-acrylamide-2-methylpropanesulfonic acid, polypropylene amine, sodium bisulfite, potassium persulfate, polyethylene glycol, Sodium p-styrene sulfonate, bentonite, diethylene glycol vinyl ether and anhydrous sodium sulfite, spare;

[0059] Take by weighing EVA hot melt adhesive, xylene, maleic anhydride, initiator, ethanol precipitation agent, rosin glyceride, antioxidant and regulator, for subsequent use;

[0060] S2: Preparation of modified microspheres:

[0061] Preparation of additives: Take 2-acrylamide-2-methylpropanesulfonic acid, dissolve in distilled water, heat to 40-50°C, stir for 15-25min, then add polyethylene glycol, sodium p-styrenesulfonate and bentonite in sequence , continue to stir for 20-30min, then add diethylene glycol vinyl ether, potassium persulfate and anhydrous sodium sulfite in turn, continue to stir for 30-40min, slowly heat up to 65-70°C, react...

Embodiment 3

[0073] S1: Prepare materials:

[0074] Weigh diallylmethylamine, hexadecane bromide, absolute ethanol, 2-acrylamide-2-methylpropanesulfonic acid, polypropylene amine, sodium bisulfite, potassium persulfate, polyethylene glycol, Sodium p-styrene sulfonate, bentonite, diethylene glycol vinyl ether and anhydrous sodium sulfite, spare;

[0075]Take by weighing EVA hot melt adhesive, xylene, maleic anhydride, initiator, ethanol precipitation agent, rosin glyceride, antioxidant and regulator, for subsequent use;

[0076] S2: Preparation of modified microspheres:

[0077] Preparation of additives: Take 2-acrylamide-2-methylpropanesulfonic acid, dissolve in distilled water, heat to 40-50°C, stir for 15-25min, then add polyethylene glycol, sodium p-styrenesulfonate and bentonite in sequence , continue to stir for 20-30min, then add diethylene glycol vinyl ether, potassium persulfate and anhydrous sodium sulfite in turn, continue to stir for 30-40min, slowly heat up to 65-70°C, react ...

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Abstract

The invention discloses a polymer gel composite plugging agent and a preparation method thereof. The polymer gel composite plugging agent comprises a gel material, modified microspheres, fibers and other components. The gel material is used as a base material, and then the modified microspheres, the fibers and other components are added therein. The water absorption and leaking stoppage effects ofthe plugging agent can be effectively improved by adding the modified microspheres, the aggregate can be filled by adding the fibers to improve the strength of the plugging agent, and the prepared plugging agent has excellent high-temperature resistance, water resistance, salt resistance, pressure resistance and the like and is good in practicability. The process is reasonable in design, component proportion is simple, and the preparation of the composite plugging agent is effectively realized. The composite plugging agent not only can be used in stratums with more fluids, but also it can beensured that the composite plugging agent still has excellent plugging performance, good high-temperature resistance, water resistance, salt resistance and the like, excellent comprehensive performance and higher practicability under a bottom layer with more fluids in a high-temperature environment.

Description

technical field [0001] The invention relates to the technical field of plugging, in particular to a polymer gel composite plugging agent and a preparation method thereof. Background technique [0002] Lost circulation refers to a kind of fluid (including drilling fluid, cement slurry, completion fluid and other fluids, etc.) that directly enters the formation under the action of pressure difference during drilling, cementing, testing or workover and other downhole operations. Downhole complex situation; lost circulation includes permeable fluid loss, fracture fluid loss, and cave fluid fluid loss. [0003] One of the reasons for lost circulation is that there are natural loss channels in the drilled formations, such as high permeability formations, fractured formations, and cavernous formations. In this case, we generally choose to use plugging agents to stop lost circulation. There will be a lot of fluid and high temperature in the cracks to a large extent. When the conven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/44C08F220/56C08F220/58C08F226/02C08F255/02C08F222/06C08F216/12C08F212/14
CPCC08F220/56C08F220/58C08F255/026C09K8/426C09K8/44C08F222/06
Inventor 刘小龙
Owner 刘小龙