Composite resin water blocking material and preparation method thereof

Abstract

The invention discloses a composite resin water blocking material and a preparation method thereof. The composite resin water blocking material comprises the following raw materials in percentage by mass: 3-9% of a formaldehyde solution, 1-4% of phenol, 1-5% of salicylic acid, 0.05-0.3% of sodium hydroxide, 0.5-3% of hydrolyzed polyacrylamide, 0.1-0.5% of a phenolic aldehyde cross-linking agent, 0.2-0.4% of a stabilizer and the balance of water. The preparation method comprises the following steps: putting water and phenol into equipment, heating to 60 DEG C, after the phenol is sufficiently molten, adding sodium hydroxide, and stirring for 30 minutes; adding the formaldehyde solution, heating to 80 DEG C, and continuously stirring for one hour; adding the salicylic acid, and stirring for30 minutes at a constant temperature; adding the hydrolyzed polyacrylamide, and stirring for 2 hours; adding the phenolic aldehyde cross-linking agent, uniformly stirring, and keeping a constant temperature of 90 DEG C, thereby obtaining the composite resin water blocking material 12 hours later. The composite resin water blocking material is applicable to oil-water well water blocking of a low permeability reservoir at a mineralization degree (200,000 mg/L or less) at a temperature (25-120 DEG C), the producible oil index can be increased by 50% or greater, the oil-water well water blocking cost can be lowered, and the economic benefits of oilfield development can be increased.

Description

technical field [0001] The invention relates to the technical field of water shutoff and production increase for oil-water wells with high water content in low-permeability oil reservoirs, in particular to a composite resin water shutoff material for water shutoff and production-increase in oil-water wells of low-permeability oil reservoirs and a preparation method thereof. Background technique [0002] In the process of oilfield exploitation, due to long-term water injection development, the water flow dominant channel is formed, and the water injection is ineffective; the physical properties of each oil layer are poor and different, the heterogeneity is serious, the cementing quality, the oil-water mobility ratio are different, and the formation structure is affected by factors such as , causing some oil and water wells to have a serious phenomenon of water layer crossing in layers, between layers or outside the pipe, causing some oil wells to break through water prematurel...

AI Technical Summary

Problems solved by technology

[0002] In the process of oilfield exploitation, due to long-term water injection development, the water flow dominant channel is formed, and the water injection is ineffective; the physical properties of each oil layer are poor and different, the heterogeneity is serious, the cementing quality, the oil-water mobility ratio are different, and the formation structure is affected by factors such as , causing some oil and water wells to have a serious phenomenon of water layer crossing in layers, between layers or outside the pipe, causing some oil wells to break through water prematurely or be flooded, reduce or lose production capacity, and directly affect the economic benefits of oilfield development

At present, the plugging technologies for oil-water wells in low-permeability reservoirs include gel, resin, cement, etc. These technologies basically meet the water plugging needs of oil-water wells, but there are still deficiencies. There are problems such as short plugging radius, weak plugging strength, and short validity period