This will help realize a temporary plugging agent under different temperatures with a good water absorption rate and water plugging selectivity and stability.
In addition, we realized microspheres that automatically adjust the surface composition and structure to yield a temporary plugging agent, which is hydrophobic during low-temperature transportation and has a low water absorption expansion rate, and is hydrophilic during high-temperature services and become a gel after absorbing water.
In addition, its surface composition and structure can be automatically adjusted to achieve a temporary plugging agent having a low expansion rate of water absorption in the low-temperature transportation process and better hydrophilicity in the high-temperature service stage.
When a workover operation is performed in a reservoir with fractures or dominant percolation channels, in order to prevent the workover fluid entering the reservoir to form a blockage, the temporary plugging agent is used to temporarily block the fractures or the dominant percolation channels [1-3].
The oil-soluble temporary plugging agent is a selective temporary plugging because it can be dissolved in oil and taken out of the reservoir during plugging removal, the permeability of the reservoir is recovered, and the damage to the reservoir is small.
At present, foamed gel, preliminarily investigated in petroleum exploitation and related industries, is mostly used as plugging agent and profile control so as to increase the mining rate of petroleum.
Yujie, "Development and application of a selective foamed gel plugging agent," Drilling & Production Technology, vol.
POLY SWELL: A co-polymer that provides excellent results when used as a lost circulation control additive and/or plugging agent
. This polymer will expand 200 times its volume in fresh water.
It can be inferred that most of the plugging agent
should migrate toward the producer through the effective region for its lower flow resistance, and that only a fraction of agent should enter the ineffective region.
(3) The non-acid-soluble temporary plugging agent was able to support fractures during filter cake removal, to prevent fractures closing, and to reduce the stress sensitivity of the fractured and fracture-pore type reservoirs.
Caption: FIGURE 4: Pore throat characteristics before and after dissolution of the temporary plugging agent in acid.
Summary: Various technical problems are currently encountered in using regular plugging agents
. The performance of this agent in terms of high temperature and salinity tolerance is poor.