«Onshore and offshore oil and gas well construction»

Substantiation of the technology of fracture permeability regulation by using auto-fracturing at the late stage of an oil field development

UDC: 622.276.66
DOI: 10.33285/0130-3872-2023-10(370)-14-24

Authors:

¹ St. Petersburg Mining University, St. Petersburg, Russia
² North Caucasian Federal University, Stavropol, Russia
³ Kuban State Technological University, Krasnodar, Russia

Keywords: methods for controlling the influence of technogenic fractures in a field, determining the presence of an auto-fracturing crack at the BS4-5 object, influence of the thermoelastic effect on the rock fracture pressure, hypothesis of a critically stressed fracture, modeling the control of an auto-fracturing crack conductivity, building a hydrodynamic model of the area of the object under study, determination of the technological efficiency of fracture permeability control

Annotation:

Fields development at their final stage sets quite specific tasks for engineers. One of them is the effective displacement of oil from reservoirs with low reservoir properties. So, for example, in the conditions of many fields with low-permeable reservoirs, the operation of wells without hydraulic fracturing is practically impossible. The consequence of this is an increase of discharge pressure in order to maintain compensation for withdrawals. In this case, there is a risk of an unplanned fracture occurrence (auto-fracturing crack). As a result, the displacement front lags behind the specified parameters and, due to non-target injection, poorly drained zones are formed. It is for this reason that the problem under consideration is relevant, because nowadays, it is necessary to take into account the formation of such fractures not only when choosing a development system, but also when operating the existing wells. The authors of the article, using the example of a West Siberian field, study the influence of auto-fracturing on the development process, the main reasons for the formation and development of such fractures are considered. Based on geomechanical and hydrodynamic modeling, a comprehensive methodology for assessing the development of fractures that lead to early water breakthrough to production wells is proposed. This methodology allows developing the optimal mode of injection wells operation.

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