Perm Journal of Petroleum and Mining Engineering

The paper outlines the technology for constructing a new conceptual geological model taking into account the structural features of the Famennian-Tournaisian deposit (T-Fm formation), which is represented by an organogenic reef structure of Late Devonian age, overlain by Paleozoic enclosing structures. This approach represents the distribution of a grid of layers of a geological model according to sedimentation processes. Based on a three-dimensional digital geological model, a geological and hydrodynamic model was created and adjusted to actual development indicators. When adapting the model to the actual dynamics of reservoir pressure, zonal features associated with the distribution of filtration and reservoir properties were identified. The dynamics of water cut were adjusted based on the results of geological and field analysis, as a result of which the source of water cut was determined for each well. Based on the geological and hydrodynamic model adjusted to the actual development indicators, forecast options were calculated: basic - at current levels of fluid production and taking into account geological and technical measures in accordance with the approved industry development program. The author’s version was calculated with optimization of planned activities, which made it possible to stabilize the falling dynamics of reservoir pressure and obtain additional oil production. The model construction technology is recommended for use in fields confined to organic reef structures of the Perm Kama region and adjacent regions of the Volga-Ural and Timan-Pechora oil and gas provinces.

Due to the natural decline in hydrocarbon production, oil producing enterprises have to carry out well stimulation methods (WSM) aimed at increasing well productivity. At the same time, despite the use of various, including progressive, geological and technical technologies, the problem of the effectiveness of industrial application of methods remains. A significant part of the implemented volume of WSM does not produce positive results in increasing the main technological and economic indicator of well operation - productivity coefficient, which is often associated with incorrect selection of wells for carrying out the designed well stimulation technology. According to the current standards in Russia, when choosing a technology for drilling into productive formations, as well as when choosing wells for WSM, it is recommended to comply with the requirements of the relevant guidance documents. The main control indicator in these documents is the coefficient of potential (i.e. natural) productivity loss of a well (K), with positive values of which decisions are made on the implementation of WSM in wells. However, due to changes in the physical properties of the reservoir continuum of wells and the hydrodynamic interaction between them, problems arise with the reliability of determining the initial parameters for calculating K, which casts doubt on the need for its participation in the process of assessing the actual state of the bottomhole formation zone (BFZ). To increase the reliability of assessing the BFZ current state degree, this work substantiates and proposes a more reliable criterion for assessing the potential productive capabilities of production wells before conducting WSM - a complex parameter Z, which has a high correlation with the actual productivity coefficient in the corresponding wells. A practical test of the introduced criterion effectiveness was demonstrated at oil wells in the Perm region. At the same time, proposed method of analyzing the collected factual information obtained during the sequential implementation of hydrodynamic well testing and WSM in the fields made it possible to increase the wells selection reliability for the priority implementation of planned measures to influence the reservoir zone. The methodological approach presented in the work to the wells selection for WSM can ensure the expected positive effect on oil production.

The subject of this work is the development of a methodology for conducting research on the concentrations of methane, carbon dioxide, oxygen and hydrogen in soils and soils in areas of upcoming construction. The developed methodology, after its certification in accordance with GOST R 8.563-2009, can be used in areas of upcoming construction during engineering surveys, with subsequent adoption of design decisions based on the measurement results. The purpose of this work is the development and experimental research in laboratory conditions of a methodology for examining a work site. The main tasks are: analysis of archival and stock materials, normative and technical documentation, published works; development and production of sampling equipment; development of “Methods for measuring the volume fractions of carbon dioxide, methane, oxygen and hydrogen in soil air using portable gas analyzers” in accordance with Appendix B to GOST R 8.563-2009; setting up and conducting experimental studies in laboratory conditions. Research results: - the equipment necessary for sampling ground air: a sampling probe with an adjustable sampling depth and a storage pump that allows you to take a sample from depth, accumulate it in a chamber, transfer the sample to a gas analyzer, with the ability to “loop” the air flow and supply air to gas analyzers without a built-in pump; - a draft methodology “Methodology for measuring the volume fractions of carbon dioxide, methane, oxygen and hydrogen in soil air using portable gas analyzers”; - an experimental assessment of the method quality indicators (repeatability and intra-laboratory precision) in laboratory conditions; - conclusions about the need to certify the methodology for compliance with GOST R 8.563-2009 using state standard samples (SSO) in the form of cylinders containing pure gases or gas mixtures with a known concentration of gases.