Abstract

Rock specimens of the reservoir’s core material from the Chayanda oil and gas condensate field (OGCF) were tested using the Triaxial Independent Load Test System of the Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences (TILTS) in order to experimentally study the effect exerted by desalinization of reservoir rocks on their strain, strength, and filtration characteristics. According to the study data, desalinization considerably increases a rock permeability. Strain and strength properties of the studied rocks change toward softening (except for an internal friction angle), nevertheless remaining relatively high. Based on the experimental physical modeling of the pressure reducing process at the bottom of a horizontal well using TILTS, a slight decrease in elastic and strength properties of the Chayanda OGCF reservoir rocks after their desalinization should not affect the stability of the well’s walls. The results obtained make it possible to draw the important practical conclusion: when operating the field at the stage of salt washing out due to water filtration under the operation process, a dramatic increase in the risks related to reservoir destruction and higher sand production should not be expected.

中文翻译：

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储层岩石脱盐对其力学及滤失性能的影响——以恰彦达油田为例

摘要

使用俄罗斯科学院伊什林斯基力学问题研究所（TILTS）的三轴独立载荷测试系统对恰扬达凝析油气田（OGCF）储层岩心材料的岩石标本进行了测试，以通过实验研究效果储层岩石脱盐对其应变、强度和滤滤特性产生的影响。根据研究数据，脱盐显着增加了岩石的渗透性。所研究的岩石的应变和强度特性朝软化方向变化（内摩擦角除外），但仍保持相对较高。根据使用TILTS对水平井底部减压过程进行的实验物理模拟，Chayanda OGCF储层岩石在脱盐后弹性和强度特性的轻微下降不会影响井壁的稳定性。所获得的结果可以得出重要的实际结论：在作业过程中由于水过滤导致的盐冲冲阶段进行油田作业时，不应导致与储层破坏和高出砂相关的风险急剧增加。预期的。