**Description:**

How to choose the right completion design, how to assess the effect of sand screens and inflow control devices on the overall well performance, how to evaluate the life of the well, how to segment the well at insulation intervals to control the flow of the fluid? These and other questions arise when modeling the design and layout of the well completion to find the optimal engineering solution. The statement of the problem of simulating the completion performance is based on the data of geological and hydrodynamic reservoir models that describe the three-dimensional transfer of formation fluid in porous media. The initial data for modeling can be divided into the following groups:

- Well information (geometric parameters, well type, equipment)
- Information on the formation (pressure, temperature, permeability, anisotropy of permeability, type of rock and fluid)
- Fluid properties (density, viscosity of fluid components, formation volume factor, gas oil ratio, phase permeability plots)
- Production information (total production, sand production, drawdown, water cut, productivity index)
- Information from the hydrodynamic model (rock properties, physico-chemical properties of PVT fluid diagrams, initial and boundary conditions for the reservoir sector under consideration)

The construction of the well model is based on the hydrodynamics of the fluid flow in the direction toward the wellbore and inside along the well. The well model uses the features of fluid flow through the surfaces of different screens and inflow control devices for different permeability profiles near the well, and also to determine the contribution of individual well intervals to the total flow of produced fluid. The use of a well model and the carrying out of appropriate simulations allows one to estimate the effects of using different configurations for the design of the completion even at the design stage, which minimizes the use of costly geophysical studies of the well behavior and its productivity. To carry out model calculations, specially developed software is used that allows testing various hypotheses on the effectiveness of using different liner design configurations, visualizing inflow processes and obtaining quantitative estimates of well productivity in the framework of numerical experiments.

**Applications****:**

- Design of the well completion
- Modeling the gas and water breakthrough into the well
- Preventing conic effect
- Using managed filters and inflow control devices
- Forecasting the well productivity for a given period

**Goals and objectives:**

In the process of modeling the operation of the well, the following tasks are solved:

- Evaluation of local skin factors of different equipment in the completion assembly.
- Determination of fluid flow profile, also pressure along a horizontal well.
- Estimation for the impact of gas and water breakthrough in the well in a certain segment of it.
- Selection of the parameter of strength ICD for aligning the inflow profile along the well.
- Assessment of the well production rate for different completion configurations.
- Accounting for the segmentation of the well to define its productivity and the period of active using.

**Advantages of using model calculations:**

The use of a hydrodynamic well model for engineering calculations has the following advantages:

- Fast and efficient way to find the best solution for choosing the completion of a well. Unlike large reservoir models, this approach makes it possible to do the necessary calculations in the local area of the well and to evaluate the effectiveness of different solutions for the liner.
- Testing the hypotheses associated with the design of the liner design even before launching into the well.
- Reducing the cost of using expensive geophysical studies.
- Forecasting of water and gas breakthroughs.