Curing agent sustained release capsule for gas injection channeling prevention, channeling prevention agent and preparation method of curing agent sustained release capsule

Abstract

The invention discloses a curing agent sustained release capsule for gas injection channeling prevention, a channeling prevention agent and a preparation method of the curing agent sustained release capsule. The curing agent sustained release capsule is prepared from the following components in parts by weight, 20-40 parts of a resin curing agent, 5-35 parts of a density regulator and 45-75 partsof a coating agent, the resin curing agent is sealed in the coating agent, and the density of the curing agent sustained release capsule is 0.66-0.8 g / cm<3>. The preparation method of the curing agentsustained release capsule comprises the following steps that all the components are evenly mixed at the high temperature according to a certain proportion, cooling is conducted to the room temperature, crushing and granulation are conducted, and thus the curing agent sustained release capsule can be obtained. The density of the curing agent sustained release capsule prepared through the preparation method is between the density of water and the density of injected nitrogen, and is closer to the density of the nitrogen, thus the curing agent sustained release capsule can flow along with a gasinjection channel after being mixed with a resin material, the curing agent sustained release capsule has excellent wellbore injectivity and meanwhile has the sustained release action, a curing reaction is generated only when the curing agent sustained release capsule enters the deep part of an oil reservoir, and the excellent plugging property is achieved.

Description

technical field [0001] The invention relates to an anti-gas channeling process in the gas injection flooding technology of high-temperature and high-salt reservoirs, in particular to a curing agent used in a thermosetting resin anti-channeling agent. Background technique [0002] Gas flooding is one of the effective technologies for enhancing oil recovery. During the gas injection process, due to the influence of reservoir heterogeneity, the injected gas often flows along channels with high flow capacity such as fractures, karst caves, or large pores, resulting in low gas injection efficiency, low reservoir recovery, and low oilfield development costs. rise. At present, there is a large demand for gas injection anti-channeling agents in oilfields. On-site injection of anti-channeling agents to chemically block gas channeling channels can effectively alleviate gas injection and gas channeling. Materials used for gas injection anti-channeling in conventional reservoirs inclu...

AI Technical Summary

Problems solved by technology

[0003] Due to the characteristics of high-temperature and high-salt oil reservoirs with a temperature greater than 120°C, formation water salinity greater than 100,000 mg / L, and large fractures and caves, which are centimeter-level, commonly used anti-channeling agents have poor adaptability to high-temperature and high-salt oil reservoirs. The specific performance is: cement has a strong plugging ability, but it is easy to differentiate by gravity and cannot enter the channel of gas channeling. It is easy to degrade under high salt and has a short validity period; the foaming ability of foam anti-channeling agent is greatly affected by shearing, which is more suitable for anti-channeling in sandstone reservoirs, but poor in foaming and plugging ability for fracture-cavity reservoirs

Resin and its composite materials have low density, can flow with gas injection, and have good wellbore injectability, but because of the low density, even if they can successfully reach the target position, they cannot effectively play a plugging role, and there is a wellbore injectability of resin. It is contradictory with the sealing property and cannot be effectively blocked

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