石油井弃井作业中膨润土堵塞的机械性能

Laura Rafaela Cavalcanti de Oliveira, Mário César de Siqueira Lima, W. R. P. D. Costa, R. L. D. N. Gonçalves, A. C. A. Costa, K. C. Nóbrega, E. Souza, L. V. Amorim
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引用次数: 0

摘要

本研究的目的是评估放置颗粒时所采用的操作程序以及暴露于地下条件的情况如何影响在废弃石油井时用作屏障元件的膨润土塞的机械完整性。为此,我们模拟陆上作业程序,将颗粒直接在水中水化形成井塞,而海上作业井塞则是将颗粒在去离子水中水化后浸泡在柴油或烯烃(建议用作置换流体)中得到的。对获得的塞子进行了压缩和附着力测试。这些机械测试也是针对暴露在四种合成地层水配方中的油塞试样进行的。结果表明,在海上作业过程中,之前与烯烃的接触可能会对膨润土堵塞的机械稳定性产生不利影响,而由浸泡在柴油中的颗粒形成的堵塞则具有令人满意的机械性能。不过,与地层水的接触表明,陆上塞比之前浸泡在柴油中的海上塞具有更好的抗性。陆上堵塞的性能非常成功,其抗压强度得以保持,即使在接触含盐量最高的地层水后,抗压强度也最大降低了 13%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mechanical Performance of Bentonite Plugs in Abandonment Operations of Petroleum Wells
This study aims to evaluate how the operational procedure adopted for pellet placement and the exposure to subsurface conditions influence the mechanical integrity of bentonite plugs used as barrier elements in the abandonment of petroleum wells. To this end, the plugs were formed by hydrating the pellets directly in water, simulating the onshore procedure, while the offshore plugs were obtained from pellets hydrated in deionized water after immersion in diesel or olefin, which are suggested as displacement fluids. The plugs obtained were tested by compression and adhesion tests. These mechanical tests were also carried out for specimens obtained from plugs exposed to four formulations of synthetic formation waters. The results obtained demonstrated that, in the offshore procedure, the previous contact with olefin may adversely affects the mechanical stability of bentonite plugs, while plugs formed from pellets immersed in diesel presented satisfactory mechanical properties. However, the contact with formation water evidenced that the onshore plug presents superior resistance than the offshore plug previously immersed in diesel. The highly successful performance of the onshore plug was attested by the maintenance of the compressive strength, which exhibited a maximum reduction of 13%, even after exposure to the most saline formation waters.
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