Temperature control liquid expanded rubber and preparation method thereof

Abstract

The invention discloses a temperature-controlled liquid swellable rubber, which contains (by weight), polyether glycol 30 to 60 percent, toluene diisocyanate 5 to 40 percent, unsaturated resin 2 to 30 percent, phenol-formaldehyde resin 2 to 30 percent, natural rubber 2 to 20 percent, catalyst 0.01 to 3 percent, reaction temperature controlling agent 5 to 40 percent, solvent 2 to 30 percent, plasticizer 2 to 10 percent, thermal stabilizer 0.5 to 2 percent, and foam regulator 0.5 to 2 percent. The preparation method comprises the following steps: adding polyether glycol into a reaction kettle at the weight percentage of 30 to 60 percent, heating to 120 DEG C, dehydrating for 30 min, cooling to 45 DEG C, adding toluene diisocyanate 5 to 40 percent, heating to 80 DEG C to 95 DEG C, keeping the temperature for 1.5 to 4 hr, cooling to 45 DEG C, adding the solvent 2 to 30 percent, adding reaction temperature controlling agent 5 to 40 percent and catalyst 0.01 to 3 percent into the reaction kettle, heating to a reaction control temperature 60 to 95 DEG C, keeping the temperature for 4 to 8hr, cooling to 45 DEG C, adding the plasticizer 2 to 10 percent, unsaturated resin 2 to 30 percent, phenol-formaldehyde resin 2 to 30 percent, natural rubber 2 to 20 percent, thermal stabilizer 0.5 to 2 percent, and foam regulator 0.5 to 2 percent, stirring for 0.5 to 1 hr, discharging, and packagingto obtain the product.

Description

technical field [0001] The invention relates to a temperature-controlled liquid expansion rubber and a preparation method thereof. Background technique [0002] At present, the production of most oilfields in my country has entered the middle and late stage of water flooding development, the water cut of oil wells is getting higher and higher, and the production decline is getting faster and faster, but the underground recoverable reserves are still relatively large. Efficiency has become a focus of the oil industry. Profile control and water plugging is a very effective technology for oil stabilization and water control. It uses mechanical or chemical methods to change the flow direction of injected water underground, improve the sweep efficiency of injected water, control the rise of water cut, stabilize oil well production, and improve underground water quality. Methods of oil recovery. [0003] Due to the common use of water injection in my country's oilfields, coupled ...

AI Technical Summary

Problems solved by technology

[0004] At present, the main profile control and water plugging products mainly include the following types: 1. Inorganic plugging agents include cement, water glass, silica gel, etc. These products have poor effect and short service life, and cannot be used for deep profile control

2. Granular profile control and water plugging products include organic, inorganic and soil products. These products have weak adsorption on the rock surface, and their strength is not enough under high pressure difference near the wellbore, and their effective period is short

3. Polymer gel products include polyacrylamide, partially hydrolyzed polyacrylamide, etc. These products have poor heat resistance and salt resistance, and are easy to hydrolyze in water and have a short service life

The method adopted is to control the cross-linking time by selecting different polymers and cross-linking agent concentration ratios, or by adding delayed cross-linking additives to prolong the gelation time of the cross-linking system, or by grafting new polymers on the PAM molecular chain. To improve the heat resistance and salt resistance of PAM, but when the temperature of PAM is higher than 70 ℃, it will be hydrolyzed, and when encountering high-valent metal ions, phase separation will occur and part of the viscosity will be lost. Therefore, the research on this kind of products has not achieved the expected results. Effect