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Environmentally friendly slow/controlled release temporary plugging agent with hydrophobically modified core-shell structure and preparation method thereof

A technology of core-shell structure and hydrophobic modification, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of temporary plugging failure, difficulty in controlling the dissolution process of temporary plugging agent, and low pressure-bearing strength, and achieve operational Simple and easy to implement, controllable sustained release time, good sustained release performance

Active Publication Date: 2022-07-01
CHENGDU LEARN PRACTICES TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides an environmentally friendly slow / controlled release temporary plugging agent with a hydrophobic modified core-shell structure and a preparation method thereof, so as to solve the problem that the dissolution process of the temporary plugging agent is difficult to control in the existing temporary plugging technology, and the pressure bearing strength during the plugging process Low, it is easy to cause the problem of temporary blocking failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Environmentally friendly slow / controlled release temporary plugging agent with hydrophobically modified core-shell structure, including a shell and a water-soluble temporary plugging particle core, wherein the shell is coated on the outside of the water-soluble temporary plugging particle core, and the water-soluble temporary plugging particle core is one or more In this embodiment, there are multiple water-soluble temporary plugging particle cores, the outer shell includes a degradable skeleton and a hydrophobic wall material, and the hydrophobic wall material is coated on the outside of the degradable skeleton. The main component of the degradable skeleton in this embodiment is modified Polyurethane, while the main component of the hydrophobic wall material is paraffin.

[0027] In this Example 1, the component of the water-soluble temporary plugging particle core is a water-soluble degradable resin such as polyvinyl alcohol, wherein the weight ratio of the degradable ...

Embodiment 2

[0033] The difference from Example 1 is that in Example 2, the coating amount of the shell, that is, the weight percentage is 30%.

Embodiment 3

[0035] The difference from Example 1 is that in Example 2, the coating amount of the shell, that is, the percentage by weight, is 40%, and the obtained slow / controlled release temporary plugging agent is measured by the water-soluble method, and its slow-release time is 15 days; Examples 1 to 3 show that with the increase of the weight percentage of the shell, the sustained release time of the temporary plugging agent is prolonged, indicating that the sustained release of the temporary plugging agent can be regulated by adjusting the weight percentage of the shell under the condition that other conditions remain unchanged. time.

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PUM

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Abstract

The invention relates to the technical field of petroleum plugging, and specifically discloses a hydrophobically modified core-shell structure environment-friendly slow / controlled-release temporary plugging agent and a preparation method thereof. On the outside of the particle core, the shell includes a degradable skeleton and a hydrophobic wall material, the component of the degradable skeleton is modified polyurethane, and the component of the hydrophobic wall material is paraffin. Preheat the water-soluble temporary plugging particles, take toluene diisocyanate, polyether polyol, chitosan, diethyltoluenediamine and epoxy resin, stir and mix them evenly, and spray them on the surface of the water-soluble temporary plugging particles to form a layer of water-soluble temporary plugging particles. Degrading the skeleton; spraying the molten paraffin on the surface of the degradable skeleton, and forming a shell structure including the degradable skeleton and the paraffin on the outside of the water-soluble temporary plugging particle core. The sustained / controlled release temporary plugging agent prepared by this patent can be adjusted in a wide range for the sustained release time, which not only achieves the effect of adjustable sustained release performance, but at the same time, the core-shell structure greatly improves the mechanical properties of the temporary plugging agent.

Description

technical field [0001] The invention relates to the technical field of petroleum plugging, in particular to a hydrophobically modified core-shell structure environment-friendly slow / controlled release temporary plugging agent and a preparation method thereof. Background technique [0002] When drilling oil and natural gas, it is necessary to effectively protect the wall and stop leakage, and also prevent the damage to the production layer caused by it. For the porous low-pressure sandstone gas reservoir, the permeability is low, and this type of gas well needs to reduce the formation damage. Therefore, in the process of drilling and production, it is necessary to carry out effective protection wall plugging. [0003] Temporary plugging technologies currently in use include: 1. Foam temporary plugging and killing technology: Because foam generation requires special equipment, the process is more complex, the cost is high, and the foam stabilization period is short, which cann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/516C09K8/508C09K8/50
CPCC09K8/516C09K8/5083C09K8/5086C09K8/50
Inventor 郭建春任山冷长松刁素卢聪曾韦邓燕刘鹏曾凡辉李代黎肖泽渝汪宇庭
Owner CHENGDU LEARN PRACTICES TECH CO LTD