Channeling preventing and plugging agent and construction method for controlling plugging and sealing channeling by utilizing channeling preventing and plugging agent

Abstract

The invention provides a channeling preventing and plugging agent and a construction method for controlling plugging and sealing channeling by utilizing the channeling preventing and plugging agent. The channeling preventing and plugging agent comprises a high-temperature-resistance pre-plugging agent serving as a pre-posed pre-plugging plug, an enhanced gel plugging agent serving as an intermediate enhanced plug and a high-strength resin plugging agent serving as a postposed sealing plug. The channeling preventing and plugging agent has the characteristics of high temperature resistance, long-term stability, good plugging performance and the like. The invention further provides a construction method for controlling plugging and sealing channeling by utilizing the channeling preventing and plugging agent. The method has a simple constructing process, and can be used for constructing after the channeling preventing and plugging agent is directly prepared on the spot. The channeling preventing and plugging agent can be used for effectively solving the adverse impact of the steam / air channeling phenomenon of a heavy oil thermal production well on production, and has an important effect on prolonging the production cycle of a heavy oil well and improving the recovery efficiency.

Description

technical field

[0001] The invention belongs to the technology of improving oil recovery rate developed in oilfields, and in particular relates to an anti-channeling and blocking agent and a construction method for regulating and blocking channeling by using the same. Background technique

[0002] Steam stimulation technology, steam flooding technology, and fire flooding technology are important means for the development of heavy oil reservoirs in my country. After multiple rounds of steam injection / gas production, due to the difference in permeability between reservoirs, plane and vertical contradictions are more prominent. It causes steam / gas to rush along the high-permeability zone, leading to serious steam / gas channeling, which makes the oil well unable to produce normally.

[0003] For steam / gas channeling wells in heavy oil reservoirs, technologies such as polymer gel and nitrogen foam gel are often used at present, which can achieve the purpose of improving the steam / g...