High-pressure-bearing plugging agent for oil extraction casing pipe and processing technology thereof

Abstract

The invention discloses a high-pressure-bearing plugging agent for an oil extraction casing pipe and a processing technology thereof. The high-pressure-bearing plugging agent for an oil extraction casing pipe comprises 48-60 parts of MOFs-modified epoxy resin, 23-27 parts of solid particles, 17-21 parts of a curing agent, 13-17 parts of a coupling agent and 0.7-1.2 parts of a curing regulator. TheMOFs-modified epoxy resin is prepared from bisphenol A epoxy resin, nano silicon nitride, an acrylate monomer, methacrylic acid, acrylonitrile, hydroxyl-terminated nitrile rubber powder and an MOFs material through multistage reaction, the modified epoxy resin is crosslinked with the curing agent and the solid particles to form the plugging agent, and the plugging agent has the advantages of highmechanical strength, strong pressure bearing capacity, high thermal stability, salt and alkali resistance and capability of slowly expanding when meeting water to enhance the sealing property. The plugging agent acts on an oil extraction casing pipe, can effectively plug leakage layers such as pores and cracks, and can extrude to prevent leakage.

Description

technical field [0001] The invention relates to the technical field of oil field chemical plugging, in particular to a high-pressure plugging agent for oil production casings and a processing technology thereof. Background technique [0002] With the long-term exploitation of oil, gas and water wells, in some old wells, the service life of the oil layer casing is too long, and the cementing cement has not completely sealed the oil layer casing. The free section, the sealing section, and the production section are perforated due to corrosion, coupled with special and complex geological conditions, the development of the salt-gypsum layer, and the movement of the earth's crust, resulting in deformation of the casing, damage to the formation, mud, water, and long-term water injection In development, especially pressurized water injection, oil and water well casing damage is very common, and the problem of well condition deterioration has become increasingly prominent, seriously...

AI Technical Summary

Problems solved by technology

Conventional gel plugging technology has achieved relatively good results in field application, but there are still some disadvantages, such as the crosslinking domain line in the polymer system, it is difficult to form a continuous space network structure, which leads to the failure of the gel plugging agent. The strength is not high, and the pressure bearing capacity is weak; the gel polymer is easily affected by the external temperature, which makes it difficult to control the gelation time and gelation strength of the plugging agent during on-site construction