Double-coating gel-coated sand-preventing particle and preparation method thereof

Abstract

A double-coating gel-coated sand-preventing particle and a preparation method thereof are disclosed. In order to overcome the disadvantages that sand prevention effect cannot be realized when a conventional resin solution, a sand solidifying agent and other solution type sand-preventing products, and plastic pre-coated sand and other artificial well-wall sand-preventing products are used in an oil well with a relatively low well temperature. The double-coating gel-coated sand-preventing particle comprises an A type particle and a B type particle, and the A type particle and the B type particle are mixed according to the weight ratio of 1:1 for usage in on-site sand-preventing operation. The A type particle is formed by successively coating a quartz sand / ceramsite matrix with a resin coating membrane and an outer isolating agent. The B type particle is formed by successively coating a quartz sand / ceramsite with an epoxy resin curing agent coating membrane and an outer isolating agent. The particle size of quartz sand / ceramsite is 0.4-0.8 mm or 0.6-1.1 mm. The beneficial effects comprise that the double-coating gel-coated sand-preventing particle can be slowly dissolved in a water environment, prevents advanced cementation solidification, and satisfies sand-preventing construction requirements on oil, gas and water injection wells with a low temperature (<=30 DEG C) during oil gas exploitation, and the technology is simple, easy to control, safe and reliable.

Description

technical field [0001] The invention relates to a sand control granule in the technical field of chemical sand control in petroleum exploitation, in particular to a double-coated rubber-coated sand control granule and a preparation method thereof. Background technique [0002] The unconsolidated sandstone reservoirs in Dagang Oilfield are very well developed. Although the geological characteristics of several unconsolidated sandstone reservoirs that have been developed are different, their main characteristics are similar, such as shallow burial, poor diagenesis, loose cementation, high shale content, vertical and horizontal The difference is large, the heterogeneity is serious, and the relationship between underground oil and water is complicated. Especially when the oilfield enters the middle and late stage of development, perfecting water injection and large-scale pumping have become the main technical means of oilfield development. The development and production methods ...

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Problems solved by technology

[0005] In order to overcome the disadvantages that existing solution type sand control products such as resin solution and sand consolidating agent and artificial well wall sand control products such as plastic pre-coated sand cannot achieve sand control effect in oil wells with low well temperature, the present invention provides a double Coating-encapsulated sand-control particles and preparation method thereof

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