An oil-soluble temperature-sensitive resin plugging agent for protecting reservoirs, its preparation method and application

Abstract

The invention provides an oil-soluble temperature-sensitive resin plugging agent for protecting reservoirs and its preparation method and application. The oil-soluble temperature-sensitive resin plugging agent for protecting reservoirs includes the following raw materials in parts by weight: 40-60 parts of resin matrix, 15-40 parts of modified asphalt, 5-12 parts of viscosity modifier, 2-5 parts of cross-linking agent, 6-15 parts of softening point regulator, and 1-3 parts of dispersant. The present invention also provides a preparation method of the above-mentioned resin plugging agent. The resin plugging agent of the present invention can be melted and bonded in different temperature ranges to realize fast plugging and long plugging time. The oil-soluble temperature-sensitive resin plugging agent of the invention will be dissolved by the oil flow during oil well production, so that the permeability of the oil layer can be restored, thereby achieving the purpose of protecting the oil-gas layer. The resin plugging agent of the present invention has the advantages of temperature sensitivity, reservoir protection, strong stability and long plugging time, can fully and smoothly enter formation fractures, and achieve the purpose of effectively plugging cracks and pores.

Description

technical field [0001] The invention relates to an oil-soluble temperature-sensitive resin plugging agent for protecting reservoirs, a preparation method and application thereof, and belongs to the technical field of drilling fluid plugging in petroleum exploration and development. Background technique [0002] In order to ensure the safe, fast and efficient drilling process, the bottom hole pressure must be kept higher than the formation pressure during drilling, and this pressure difference will lead to the loss of drilling fluid when drilling into permeable or fractured formations. Lost circulation leads to the loss of a large amount of drilling fluid, which increases the drilling cost; and the lost drilling fluid enters the formation, which will destroy the permeability of the reservoir and reduce the recovery rate of the oil and gas field, which is a problem that must be faced in oil and gas production. [0003] At present, although a large number of different types of ...

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Problems solved by technology

For example, Chinese patent document CN104388068A provides a kind of high-temperature oil-soluble temporary plugging agent and its preparation method. The temporary plugging agent is composed of 10-40% by weight of pitch, 20-50% of C9 petroleum resin, 15 -50%, surfactant 5-15%, polymer fiber 2-15%, softening point additive 1-10%, but the above-mentioned oil-soluble temporary plugging agent has low oil solubility at high temperature and poor oil solubility , failed to protect oil and gas layers well

Chinese patent document CN111793485A provides a water blocking agent, according to mass percentage, 65-90% oil-soluble resin, 2-5% industrial gelatin, 3-25% plasticizer, 2-4% softening point adjustment agent, 0.5-1.0% crosslinking agent, and 0.3% dispersant, but the above water blocking agent has poor high temperature resistance and short blocking time

[0005] At present, oil-soluble lost circulation plugging agents generally have defects such as low plugging strength, narrow temperature range and poor oil solubility, and cannot be used in different formations

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