Gel double-solution plugging regulating agent of steam injection well for thermal recovery and plugging regulating method using gel double-solution plugging regulating agent

Abstract

The invention relates to a gel double-solution plugging regulating agent of a steam injection well for thermal recovery and a plugging regulating method using the gel double-solution plugging regulating agent. The gel double-solution plugging regulating agent is a dark brown solution prepared by dissolving and mixing a first working solution and a second working solution in formation water at a normal temperature, wherein the first working solution is composed of sodium nitrohumate and formaldehyde and is black brown and slightly sticky; the second working solution is composed of resorcinol and a coagulant aid HPAM (Hydrolyzed Polyacryamide) and is colourless and slightly sticky and free of pungent smell; the first working solution comprises the two components by weight percent as follows: 6% to 7% of sodium nitrohumate and 1.2% of formaldehyde and the second working solution comprises the two components by weight percent as follows: 2.2% of resorcinol and 0.015% to 0.035% of HPAM; and the sodium nitrohumate is prepared by steps of carrying out a nitration modification reaction on sodium humate and 65% concentrated nitric acid in a condensation reflux device at 90 DEG C, and stirring and drying by distillation, wherein the weight ratio of sodium humate to 65% concentrated nitric acid is 1:6. According to the method, a high-permeable channel is plugged preferentially, so that the gel can be transported in a glue ball manner after being sheared. Thus, the purpose of deep profile control is reached. The gel double-solution plugging regulating agent has a subsequent oil-stabilizing and water-controlling ability.

Description

[0001] 1. Technical field: [0002] The invention relates to a profile control agent used in oil field chemical water plugging and profile control technology in petroleum engineering, in particular to a gel double-liquid plugging regulating agent for thermal recovery and steam injection wells and a plugging regulating method thereof. 2. Background technology: [0003] Steam flooding is currently the key technology for improving the recovery of heavy oil reservoirs in China. As the development enters the middle and later stages, the heterogeneity of the reservoir causes uneven steam absorption profiles in the vertical direction, which is prone to steam channeling. The high-temperature plugging control technology can Force the steam to turn, expand the swept volume, and improve the utilization rate of steam. At present, domestic high-temperature profile control mainly adopts three methods to deal with conflicts between different layers: plugging, plugging adjustment, and flood...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of gel two-liquid plugging regulating agent for thermal production steam injection well, another object of the present invention is to provide the plugging regulating method of this thermal recovery steam injection well gel double liquid plugging regulating agent, it uses To solve the problem of uneven steam absorption in the vertical direction between layers around the steam flooding injection well in heavy oil reservoirs