Application Research of Bridge Plug Packer Rubber Tube Ablation Technology in Gas Storage

Abstract

In the production process of oil and gas fields, for old wells, sealed wells, etc., if the bridge plug or packer is inserted into the well for a long time, the sealing cylinder will harden under the high-temperature and high-pressure environment of the wellbore. The sealing cylinder cannot contract normally and tightly adhere to the inner wall of the casing. During the tool unsealing and lifting process, impurities such as scale and rust on the casing wall will be scraped off and continuously accumulated, ultimately causing the bridge plug or packer to jam and unable to successfully complete the tool unsealing and salvage. During construction, the method of repeatedly moving the pipe column and suspending it is usually used for unblocking, and nitrogen gas lifting and lowering liquid construction is added, but the results are not ideal. During the process of moving the tubing, fatigue damage to the tubing increases the risk of well control and complex wellbore conditions, while significantly prolonging the construction period and increasing construction costs. Therefore, it is urgent to develop a degradation and ablation agent for hardened rubber parts, which can degrade and soften the hardened rubber cylinder, ensuring the smooth operation of tool salvage. Rubber products obtained through normal cross-linking reactions exhibit a regular grid like molecular structure, which can resist the invasion of organic molecules and oxidant molecules. This is also the reason why rubber products are resistant to organic solvents and acid-base corrosion. The experiment proposes to use a combination of "dissolution" and "destruction" methods to soften and melt the excessively cross-linked and hardened rubber cylinder.