Expansion-controllable plugging agent

Abstract

The invention relates to the technical field of a plugging agent, especially to an expansion-controllable plugging agent. The expansion-controllable plugging agent is prepared from the following raw materials, by weight, 60-80 parts of polyacrylamide, 10-20 parts of meerschaum, 10-20 parts of teflon, 5-10 parts of a flexibilizer, 7-15 parts of a dispersant and 3-9 parts of a coagulant enhancer. The expansion-controllable plugging agent can control expansion speed, has good deformability and adaptability, can reduce permeability of a plugged zone, enhance strength of the plugged zone and raise pressure-bearing capacity of the plugged zone, is low-cost, is non-toxic, harmless and pollution-free, and is green and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of plugging agents, in particular to a controllable expansion plugging agent. Background technique [0002] The earliest plugging material used at home and abroad is bridging plugging material, which is used in bridge plugging technology. The bridge plugging technology is well-received for its safety, economy and simple operation process, and it is widely used in the field. However, the current plugging materials have the following defects: First, their own deformability is poor during the plugging process, and particles that are slightly larger than the pores and cracks of the leakage layer or that do not match the shape of the pores and cracks of the leakage layer are not easy to enter. Formed piles on the surface, but did not go deep into the leakage layer. The second is that the plugging material does not have expansibility or only has a small amount of expansion, so it is not easy to stay in the leaka...

AI Technical Summary

Problems solved by technology

However, the current plugging materials have the following defects: First, their own deformability is poor during the plugging process, and particles that are slightly larger than the pores and cracks of the leakage layer or that do not match the shape of the pores and cracks of the leakage layer are not easy to enter. Accumulation formed on the surface, but did not go deep into the leakage layer

Second, the plugging material does not have expansibility or only has a small amount of expansion, so it is not easy to stay in the leakage layer stably under the action of external force

Thirdly, because the opening size of leaky joints in the stratum cannot be accurately grasped, the plugging plan can only be formulated based on the limited data analysis and experience on site. Often there will be problems of stopping the leak once it is blocked and repeating the leak after a cycle, resulting in huge manpower, material and financial resources. loss

Due to the above reasons, when using these plugging materials, it is easy to cause poor plugging effect and repeated leakage after plugging

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