A kind of resin material for oil and gas well casing plugging and preparation method thereof

Abstract

The invention belongs to the technical field of petroleum exploitation, and in particular relates to a resin material for leakage plugging of oil and gas well casings and a preparation method thereof. The present invention prepares polyester with a mass percentage of 65%-85% through five steps of preparing a polyester resin mixture, adding a coupling agent, adding a curing agent, adding a filler, adding an additive and a polyol solvent. Resin, 0.6%-3% curing agent, 3%-5% filler, 0.5%-1.5% coupling agent, 1%-3% additive, and the rest is polyol solvent for oil and gas well casing plugging Resin material. The invention has high strength, good cementation and small volume change rate, and is not only suitable for leak plugging of casing damage in production wells, but also suitable for plugging of casing damage in fracturing of new wells and plugging of old fractures in old wells. The invention has low initial viscosity, and after shearing, the viscosity decreases, which is convenient for ground construction operation, and the viscosity is gradually increased to solidification after reaching the reservoir. The raw materials used in the invention are easy to obtain, the preparation process is simple, and the construction process is simple and easy.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a resin material for leakage plugging of oil and gas well casings and a preparation method thereof. Background technique [0002] With the increase of the production life of multi-layer oilfields, coupled with the influence of geological conditions and engineering factors, casing damage and leakage of fluid outside the casing often occur, which affects the stable production of the oilfield and the smooth implementation of the development plan, and even causes production shutdown, seriously affecting It improves the effective water injection and ultimate recovery of the reservoir. Casing deformation of oil and water wells is aggravated, which increases the cost of workover and production operations. At present, the commonly used channeling and leakage sealing technologies mainly include casing subsidy and chemical leakage sealing. Casing subsidy techno...

AI Technical Summary

Problems solved by technology

Casing subsidy technology can easily cause the diameter of the casing to shrink, which brings inconvenience to the later operation

Conventional chemical plugging mainly relies on cement, and its main problems are low compressive strength, pressure wells cannot be injected into the annulus, and cement is easy to shrink, resulting in cracks or micro-cracks, resulting in poor cement quality and other problems

Conventional gel and thermosetting resin plugging agent systems also have the following problems: (1) the amount of plugging agent used is large, and the construction cost is high; (2) the system cannot be cured at right angles, and the volume shrinks, resulting in water-proof sealing; (3) after curing Insufficient pressure bearing capacity and other issues, especially the complete wellbore of 55MPa required for horizontal well fracturing

[0003] Chinese Patent No.: CN106800389A discloses a high wall-building sealing channeling plugging agent, which is mainly cement, there are cracks after curing, and the air tightness is insufficient; Chinese Patent No.: CN 108166944 A discloses a kind of oil and gas well damage Casing repair method and rapid fluid loss plugging slurry, which is a pre-filter loss system such as walnut shells and fibers, followed by a gel system based on ABS resin, and its compressive strength can reach oil well production or drilling plugging , failing to meet the fracturing requirements after casing repair

Chinese Patent No.: CN 107474808 A discloses a resin plugging agent for casing plugging in oil and gas wells. The plugging agent is based on industrial urea formaldehyde and curing agent. Its own strength is low and its compressive strength is insufficient.

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