Oil well deep composite blocking profile control agent and application thereof

Abstract

The invention relates to an oil well deep composite blocking profile control agent and the application thereof. The composite blocking profile control agent comprises the following components: gel blocking agent solution, particle blocking agent, authigene air source and surface active agent, wherein in the gel blocking agent solution, the weight ratio of the partially hydrolyzed polyacrylamide, the sodium bichromate and the sodium thiosulfate pentahydrate is 1:0.025:0.35, a water solution with the total weight concentration of 0.5-1% is prepared from the partially hydrolyzed polyacrylamide, sodium bichromate and sodium thiosulfate pentahydrate, and hydrochloric acid capable of adjusting the pH of the gel blocking agent solution to 3.5-4.5 is contained; the particle blocking agent comprises phenolic resin and phenolic resin, wherein the weight ratio of the phenolic resin and the phenolic resin is 1:0.06; the authigene air source is CO(NH2) 2; the surface active agent is alkylaryl sulfonate; the weight ratio of the gel blocking agent solution, the particle blocking agent, the authigene air source and the surface active agent is 60:6:2:1. According to the composite blocking profile control agent disclosed by the invention, deep blocking and profile control at the oil layer of an oil well is realized through the Jamin Effect of foam generated in the deep part of stratum and the physical blocking function of a solid phase blocking agent.

Description

technical field [0001] The invention relates to a deep compound plugging profile control agent for oil wells and an application thereof. Background technique [0002] The ultra-heavy oil reservoir in Shuguang Oilfield has the characteristics of "shallow, thick and scattered" reservoirs with loose cementation, high permeability, serious formation heterogeneity and large porosity. In the process of steam injection production, there are common problems such as serious steam fingering or overlapping, steam channeling between wells, and low thermal efficiency of steam. As the huff and puff enters a high cycle, the original contradictions in the formation further increase, and the specific manifestations are: the near-wellbore area has a serious deficit, the channel of steam channeling increases, and the difference of steam absorption between layers expands. At present, the technological measures mainly adopt the technology of temporary plugging and channeling, which has achieved...

AI Technical Summary

Problems solved by technology

However, as ultra-heavy oil wells enter high rounds of huff and puff, due to the limitations of reservoir conditions and plugging agents themselves, the disadvantages of the granular type and gel type plugging agents used in the current temporary plugging and channeling technology are becoming more and more obvious: First, Due to the high porosity and high permeability of the reservoir, after the application of granular plugging agent for plugging, the subsequent injection of steam will bypass the carbonized and compacted granular plugging agent, forming a direction-changing burst, and then forming steam channeling to affect adjacent wells

Second, the particle plugging agent mainly enters the high-permeability layer (generally the high-permeability layer is also the main production layer), and stays in the oil layer for a long time (2 to 4 cycles), which affects the cycle production effect of the measure well to a certain extent

The third is that the current common gel-type plugging agent has poor temperature resistance (generally above 150°C, it will break the gel), and the plugging effect is mainly caused by the solid phase added in the solution.

At the same time, affected by the cost of the measures, the amount of gel and the plugging radius are limited. At present, it is mainly used in oil wells with high steam injection pressure, and the application range is limited.

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