Full liquid phase airflow diversion agent for deep oil reservoir and preparation method of full liquid phase airflow diversion agent

Abstract

The invention provides a full liquid phase airflow diversion agent for a deep oil reservoir and a preparation method of the full liquid phase airflow diversion agent. The diversion agent is prepared from a slug I, insulating liquid and a slug II, wherein the volume ratio of the slug I to the insulating liquid to the slug II is (15 to 30) to (45 to 73) to (12 to 25); the slug I is prepared from thefollowing raw materials: a water glass solution, ammonium oxalate, glycerol polyoxyethylene ether, methoxy polyethylene glycol, ammonium chloride and the balance of water; the insulating liquid is prepared from the following raw materials: alpha-sodium olefinsulfonate, iso-tridecanol polyoxyethylene ether and the balance of water; the slug II is prepared from the following raw materials: ammoniumcarbonate, lauryl alcohol polyoxyethylene, polyanionic cellulose, castor oil polyoxyethylene ether, polyethylene glycol and the balance of brine. The invention also provides the preparation method ofthe diversion agent. The diversion agent disclosed by the invention has good temperature resistance; in addition, the plugging strength can be controlled, the construction is safe and convenient, andblockage of a tubular column is avoided.

Description

technical field [0001] The invention relates to a diverting agent, in particular to an all-liquid-phase air diverting agent suitable for deep oil reservoirs, and belongs to the technical field of petroleum exploitation. Background technique [0002] With the continuous improvement of the development degree of steam flooding, the contradictions caused by the heterogeneity of the reservoir, the specific gravity and viscosity of oil, steam and water, such as steam overlay, fingering, steam channeling, and uneven effect between layers, will be directly reduced. steam flooding effect. [0003] At present, there are mainly two types of solutions, mechanical methods and chemical methods. Among them, the mechanical method generally adopts layered steam drive technology, which is mainly aimed at oil layers with well-developed interlayers to solve the problem in the near-wellbore zone; the chemical method generally adopts high-temperature Blocking the channeling channel can solve th...

AI Technical Summary

Problems solved by technology

However, due to the fact that the solid phase particles in the conventional chemical profile control are easy to block the steam injection pipe string, it often causes serious accidents such as overhaul, and there is a huge safety risk

[0004] The current diverting agents include inorganic type, polymer type, foam type, etc. The inorganic type has good plugging performance, but the plugging radius is small, so it can only be plugged near the wellbore; the polymer type has a certain plugging ability, But the heat and salt resistance is poor; the foam type can increase the flowback capacity, but the plugging strength is low and the validity period is short

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