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Core studies

The study of the core makes it possible to determine the physical and chemical properties of the rock, its permeability, the presence of oil or gas, as well as predict production conditions and assess the economic value of the deposit.

Conducting core studies in the process of building geomechanical models makes it possible to calibrate the model as accurately as possible and reduce its error ranges to a minimum.

PetroGM Company performs various types of core studies, including

  • Visual inspection and classification: During the initial inspection of the core, its external characteristics are determined: rock type, colour, texture and presence of fractions. The core is classified according to various parameters such as rock composition, structure, thickness and oil or gas saturation.
  • Granulometric analysis: the size and distribution of particles in the rock is determined. This allows the granulometric composition of the core to be determined and gives an idea of its porosity and permeability.
  • Physical property analysis: includes measurement of core density, water saturation, permeability and porosity. These parameters help to determine the oil and gas potential of the rock and its ability to flow and accumulate liquids or gases.
  • Chemical analysis: determines the amount and type of minerals in the rock. It also analyses organic matter, including hydrocarbon content, and determines the history of diagenesis and catagenesis of the rock.
  • Petrographic analysis: involves a detailed examination of the structure and composition of the rock using a microscope. It allows the mineral composition of the rock and its texture to be determined.
  • Fluid analysis: an analysis of the oil and gas content in the core, its physico-chemical properties and composition is carried out. This helps to assess the resource potential of the reservoir and predict the phase behaviour of the fluids.

A separate type of investigation is geomechanical core load testing, which provides information on the mechanical properties of the rock and its fracture parameters. PetroGM has experience in most types of studies used in the industry, ranging from standard UCS, TSTR, to various multi-stage tests.

We carry out filtration tests on the core, for example by acid treatment or saturation with various fluids. Tests under atmospheric and reservoir conditions, with different crimps. We interpret and reinterpret the generated data ourselves.

The highest level of expertise and complete understanding of reservoir conditions enables the company to carry out the most complex core investigations. We perform tests both according to GOST and using our own methods in cases where it is not correct to conduct experiments according to GOST.

The results of the Core studies service are used to solve the following tasks:

Frac and Multistage-frac design

Hydraulic fracturing (HF) is the creation of a highly conductive fracture in the target formation under the action of a proppant fluid injected into it to increase the production of fluids (oil, gas, condensate, etc.). A fracture is formed if the injection pressure is greater than the fracture pressure of the rock. After hydraulic fracturing, the well flow rate, as a rule, increases sharply.

 Sanding evaluation

Most of the world's hydrocarbon reserves are in productive formations in weak rocks, which are destroyed during development. When destroyed, the rock enters the well through perforations or an open hole, which leads to failure of downhole equipment, a decrease or complete absence of flow rates.

 Optimisation of injections

Waterflooding is the process of pumping water into an oil reservoir through injection wells to maintain reservoir pressure and displace oil towards a production well. Preservation of reservoir pressure by water injection maintains the drawdown between the rock and the well, and as a result leads to improved oil recovery, an increase in the period of production well operation and an increase in total oil production. In fields with a gas cap, gas is very often used as an injected reagent.

 Selection of well completion systems Optimisation of production regimes Wellbore stability

Based on the obtained parameters of the geomechanical model for the planned well trajectory, the Wellbore Stability Calculation (WBS) is performed

 Selection of drilling bit parameters Well's geomechanical modeling

1D - or borehole modeling is the base for geomechanical modeling. The 1D geomechanical model is a numerical representation of the Mechanical Earth Model (MEM) of the rock along the well trajectory. Such a model should reliably describe the behavior of the rock mass in terms of deformation and destruction

 3D-Geomechanics

3D - geomechanical modeling allows you to fully take into account the change in the geological section along the lateral and the influence of tectonics. As a result of the simulation, the mechanical properties, pressures and stress-strain state at each point of the volume under study are determined. The model is built from the day surface to the horizons lying under the developed reservoirs

 4D-Geomechanics

4D - geomechanical modeling - is the construction of a dynamic model - the necessary parameters are modeled not only in terms of the volume of the rock mass, but also in time
Frac and Multistage-frac design Sanding evaluation Optimisation of injections Selection of well completion systems Optimisation of production regimes Wellbore stability Selection of drilling bit parameters Well's geomechanical modeling 3D-Geomechanics 4D-Geomechanics