新型选择性液体堵水剂制备及性能研究

Preparation and Performance Study of A New Selective Liquid Water Plugging Agent

摘要

随着油藏的注水开发与过度开采，油井出水的问题日益凸显，通常采用堵水作业来提升油气采收率及水驱油效率。其中，选择性堵水剂由于其能够实现精准封堵水层，减少对储层的伤害，受到了广泛的关注。但目前现有选择性堵水剂的封堵强度及抗温性能有限，使得其在高温、高压地层中的应用受到了极大的限制。为此，基于倒相法的思路，以植物纤维与高强度聚合共混物为基础，研制了一种新型耐高温、高强度选择性液体堵水剂，该堵水剂能够实现遇水后从低黏液体转变为高强度固体材料的相态转变，从而实现精准封堵水层。同时对该堵水剂的选择性封堵成功率、耐温性能、抗压性能进行了评价。研究表明，该堵水剂具有良好的流动性，且能够实现水层的精准选择性封堵，同时其耐温可高达120^◦C，承压高达9.99 MPa，且阻水率高达100%。

Abstract

With the development of water injection and over exploitation of oil and gas reservoirs, the problem of water production from oil and gas wells has become increasingly prominent. Water plugging operations are usually used to enhance oil recovery and water drive efficiency. Among them, selective water plugging agents have received widespread attention due to their ability to achieve precise water plugging and reduce damage to the reservoir. However, the strength and temperature resistance of the selective water plugging agents currently in use are limited, which greatly restricts its application in high-temperature and high-pressure formations. Therefore, based on the idea of the non-solvent-induced phase inversion method (NIPI), a new type of selective liquid water plugging agent with high-temperature resistance and high-strength has been developed based on plant fibers and high-strength polymer blends. The water plugging agent can achieve a phase transition from a low-viscosity liquid to a high-strength solid material upon contact with water, thus achieving precise water plugging. At the same time, the selective plugging success rate, temperature resistance, and compressive properties of the water plugging agent were evaluated. The study showed that the water plugging agent has good fluidity and can achieve precise selective water plugging of the water layer. At the same time, its temperature resistance can reach 120^◦C, pressure resistance can reach 9.99 MPa, and water blocking rate to 100%.

关键词

选择性堵水剂 / 耐高温 / 高强度 / 液体堵水剂 / 倒相法

Key words

selective plugging agent / high temperature resistance / high strength / liquid water plugging agent / non-solvent-induced phase inversion

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