Inorganic gel profile control agent suitable for thermal oil recovery and use method thereof

Abstract

The invention discloses an inorganic gel profile control agent suitable for thermal oil recovery and a use method thereof, and relates to the chemical field of oil field application. The inorganic gel profile control agent is prepared from gel emulsion and inorganic matter formation sealant, wherein the mass ratio of weak gel emulsion is 85-90%, and the mass ratio of the inorganic matter formation sealant is 10-15%; the weak gel emulsion is prepared from parts of HPAM (hydrolytic polyacrylamide) with a relative molecular weight of 1000*10<4>, an organic chromium system, aluminum citrate, sodium fluosilicate and prepared water, and the inorganic matter formation sealant is montmorillonite. The use method comprises the following steps: combining with oil field production data to design a profile control agent injection amount; after the profile control agent finishes being prepared, injecting into a stratum via an oil field injection well; after a preset range is achieved, standing for 2-3 days to cure the profile control agent; after curing, carrying out a subsequent injection production operation. According to the profile control agent, the high-temperature stratum can be effectively sealed, the profile control agent can be applied to thermal force oil extraction ways including in-situ combustion, steam flooding, SAGD (Steam Assisted Gravity Drainage), mixed-phase thermal fluid flooding and the like; before the weak gel emulsion is cured, viscosity is low, and the weak gel emulsion can be easily injected, can be suitable for a mineralization degree below 100000mg, is cheap and easy to obtain.

Description

technical field [0001] The invention relates to an inorganic gel profile control agent suitable for thermal oil recovery and its use method. The profile control agent can improve the adaptability of high-temperature reservoirs, and further improve the oil-increasing effect of the high-temperature oil displacement state of the oil layer, and belongs to the field of oilfield applied chemistry . Background technique [0002] In recent years, oil recovery technologies such as burning oil layers, steam flooding, and miscible thermal fluid flooding have been applied on a large scale and field experiments in many oilfields in my country. Crude oil is easier to be recovered. However, in actual production, problems such as formation heterogeneity, high-permeability layers, and large pores are often encountered. Traditional profile control technologies are difficult to exert corresponding effects in high-temperature formations, such as burning The temperature of the formation in the oi...

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Problems solved by technology

[0002] In recent years, oil recovery technologies such as burning oil layers, steam flooding, and miscible thermal fluid flooding have been applied on a large scale and field experiments in many oilfields in my country. Crude oil is easier to be recovered. However, in actual production, problems such as formation heterogeneity, high-permeability layers, and large pores are often encountered. Traditional profile control technologies are difficult to exert corresponding effects in high-temperature formations, such as burning The formation temperature in the oil layer can reach 300-500 degrees Celsius. Traditional organic profile control agents will degrade and burn at this temperature, thus losing the profile control effect

[0003] Therefore, the present invention proposes an inorganic gel profile control agent suitable for thermal oil recovery and its use method, which can seal the high-temperature oil layer by combining the inorganic plugging agent with the gel, and solve the problem of difficult profile control in thermal oil recovery

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