Casing damage leakage well high-efficiency phenolic resin water plugging agent and application thereof

Abstract

The invention provides a casing damage leakage well high-efficiency phenolic resin water plugging agent and an application thereof; the water plugging agent is composed of the following raw materials in parts by weight: 30-90 parts of phenolic resin, 1-5 parts of urotropine, 0.1-1 part of potassium polyacrylate, 5-25 parts of silica fume, and 24-79 parts of water. The water plugging agent is applied for water plugging of a casing damage leakage water injection well with the temperature of 60 DEG C-130 DEG C; firstly, 60 mesh-100 mesh quartz sand is added into the well, the sand amount is equal to the volume from the depth of a casing damage leakage layer to the interior of an artificial well bottom casing pipe, the position from the sand surface to the casing damage leakage layer is reserved, and the amount of the water plugging agent is calculated according to the formula Q=[Pi]r<2>h[Phi], wherein r represents the water plugging agent treatment radius, h represents the casing damage leakage layer thickness, and [Phi] represents the casing damage leakage layer porosity; then the water plugging agent is pumped and injected into a leakage stratum, pumping injection is stopped until the injection pressure is increased to 3-5 MPa, the responding time to close a wellhead gate is not less than 48 hours, and the water plugging agent is overall cured at the casing damage leakage part and the stratum.

Description

[0001] Technical field: [0002] The invention relates to a water shutoff agent for well water shutoff due to casing damage in oil development, especially a high-efficiency phenolic resin water shutoff agent for casing loss leak wells and its application. [0003] Background technique: [0004] In oil development, many water injection wells that have been in production for decades and have been produced for many years have casing damage due to various reasons, causing the injected water to leak along the casing damage and cannot enter the oil reservoir, resulting in long-term invalidation or failure of the water injection well. Low-efficiency production cannot achieve the effect of effective oil displacement. The phenolic resin water shutoff agent used for casing loss water injection well water plugging is generally a mixed solution of a variety of chemical materials, mixed evenly during use, and pumped into the well, and pushed from the casing loss part to the formation that n...

AI Technical Summary

Problems solved by technology

Casing loss water injection wells have water injection layers and leakage layers, and the leakage layers are mostly loose sandstone formations. The formation channels are affected by many complex factors such as sandstone cementation type, natural pore structure, channel size, and pore inner surface properties, which determine their flow rate. The difference in capacity is large, and the uniform solution always advances to the leakage zone along the direction of the minimum flow resistance, and the result is that the plugging target layer must be partially infiltrated, with large distribution differences, and cannot evenly enter all the pore channels in the part to be plugged , unable to achieve complete overall blockage

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