Core acid treatment influence on well reservoir properties in Kazan oil-gas condensate field

19th International Scientific Symposium in honor of Academician M.A. Usov "Problems of Geology and Subsurface Development"

Janishevskii, A.^1 ; Ezhova, A.^1

Department of Mineral Exploration, Institute of Natural Resources, National Research Tomsk Polytechnic University, 30 Lenin Ave., Tomsk

634050, Russia^1

关键词: Comparative analysis;    Effective porosity;    Hydrochloric acid treatment;    Intergranular contacts;    Mineral composition;    Pore space structure;    Reservoir property;    Sample collection;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/27/1/012012/pdf
DOI  :  10.1088/1755-1315/27/1/012012

来源: IOP

【 摘 要 】

The research involves investigation of the influence of hydrochloric acid (HCI-12%) and mud acid (mixture: HCl - 10% and HF - 3%) treatment on the Upper-Jurassic reservoir properties in Kazan oil-gas condensate field wells. The sample collection included three lots of core cylinders from one and the same depth (all in all 42). Two lots of core cylinders were distributed as following: first lot - reservoir properties were determined, and, then thin sections were cut off from cylinder faces; second lot- core cylinders were exposed to hydrochloric acid treatment, then, after flushing the reservoir properties were determined, and thin sections were prepared. Based on the quantitative petrographic rock analysis, involvin 42 thin sections, the following factors were determined: granulometric mineral composition, cement content, intergranular contacts and pore space structure. According to the comparative analysis of initial samples, the following was determined: content decrease of feldspar, clay and mica fragments, mica, clay and carbonate cement; increase of pore spaces while in the investigated samples- on exposure of rocks to acids effective porosity and permeability value range is ambiguous.