STUDY OF THE FORMATION OF A WELL BOREHOLE ZONE WHEN OPENING CARBONATE RESERVOIRS TAKING INTO ACCOUNT THEIR MINERAL COMPOSITION
| Autor: | Vasily I. Chernykh, Dmitriy A. Martyushev, Inna N. Ponomareva |
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| Jazyk: | ruština |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Известия Томского политехнического университета: Инжиниринг георесурсов, Vol 333, Iss 12, Pp 129-139 (2022) |
| Druh dokumentu: | article |
| ISSN: | 24131830 2500-1019 2413-1830 |
| DOI: | 10.18799/24131830/2022/12/3806 |
| Popis: | The relevance of the research is caused by the significant influence of the permeability of bottomhole zones of productive formations on well productivity. In practice, a decrease in reservoir permeability in bottomhole zones is often caused by the effects accompanying the interaction of the filtrate of process fluids used in the construction and workover of wells. In turn, the study of the features of the interaction of various process fluids and rocks will allow you to effectively plan operations for the construction and repair of wells. The main aim of the research is to study the features of the interaction of process fluids and rocks based on the integrated use of modern laboratory studies of core and field data. Object: bottomhole zones of wells operating a carbonate object of oil field development. The methods: hydrodynamic studies of wells, processed in the KAPPA Workstation software (Saphir module), using the methods of tangential and deterministic pressure moments with an assessment of the state of bottomhole zones; modern methods of laboratory core research, including electron microscopy, X-ray phase analysis, micro-X-ray tomography. The results. When processing the materials of hydrodynamic studies, it was found that the state of the bottomhole zone in 70 % of the wells of the fund is characterized as degraded, and in some wells – to a large extent, which is not typical for carbonate reservoirs. Water-based drilling fluid was used in all wells during formation opening. Studies of core samples from this deposit (at the micro level) made it possible to establish the complex structure of the void space, including the presence of cracks partially healed by clay material. The interaction of clay material with the water base of the drilling fluid is one of the common reasons for the decrease in the permeability of the reservoir in the zone of its contact with the drilling fluid. Similar studies performed in another field with no clay material in the voids demonstrated the effectiveness of the same water-based drilling fluids, which is confirmed by the almost unchanged state of the bottomhole zone after the wells were put into production. |
| Databáze: | Directory of Open Access Journals |
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