New Generation Hydraulic Fracturing Simulator

RN-GRID provides all the necessary engineering tools for hydraulic fracturing (HF) design and analysis. Hundreds of engineers, thousands of successful hydraulic fracturing treatments — in RN-GRID we have implemented the best engineering practices and all the accumulated experience of Rosneft HF specialists.

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What's new

We constantly work to improve RN-GRID, releasing new versions every 6 weeks.

Physical and Mathematical Model

Benefits

Physically Reliable Planar3D Numerical Model

Most hydraulic fracturing simulators available on the market and used by engineers make use of a simplified physical and mathematical models that simply do not feasibly simulate real fractures of complex shape. Our implementation of the Planar3D model describes most of the important effects of fracture growth and proppant transfer.

Layered Geomechanical Model

The bedding model, which determines the geomechanical properties of all the layers, can be quickly built automatically based on a given well log and lithotype cutoffs — or built interactively by an engineer who, in accordance with his reservoir understanding, places layer after layer, using the well log as a sketch. The list of geomechanical properties to be filled depends on the user-selected fluid leak-off model and the use of thermal or acid options.

Multiple Fluids and Proppants

RN-GRID allows the use of several fluids and proppants in one treatment schedule. Unlike other simulation software, the proppants in RN-GRID are tracked separately, so they can mix, and fluids with different rheology are allowed to interact in a physically adequate manner, forming the so-called viscous fingers. Each proppant is simulated and visualized in accordance with its density and average particle size.

Settling, Acceleration, Dragging, Bridging and Mobilization of Proppant

RN-GRID describes most of the phenomena associated with the transport of proppant along a fracture in physically adequate way, including: sedimentation of proppant in a low-viscosity fluid, proppant acceleration and dragging in a fluid flow, proppant bridging in narrow places of the fracture, and re-mobilization of proppant with the susequent fracture opening. Unlike other hydraulic fracturing simulators, RN-GRID does not use global bridging, simulating the condition of bridging and mobilization in each cell separately.

Time and Temperature Dependent Rheology

The rheological properties of the fracturing fluids are stored in an extensive database of fluids and proppants. Effective viscosity of the slurry depends not only on the proppant concentration, but also on time and temperature.

Acid and Acid-Proppant Fracturing

RN-GRID allows simulating acid and acid-proppant hydraulic fracturing. Treatment schedule fluids are simply replaced with specific acids from the database, and the properties of geomechanical layers describe their interaction with the acid. The simulated acid-etched width map is used to simulate the acid-induced fracture conductivity with specific correlations.

Typical Design and Analysis of Hydraulic Fracturing Treatment

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Creation of HF Design

The creation and matching of HF designs is carried out using convenient tools that automate most of the routine operations:

  • Well trajectory and surveys are loaded automatically from most file formats.
  • Reservoir layering model and a lithologic column is produced from standard LAS files and user-defined and user-controlled lithotype bounding values.
  • Geomechanical properties of layers can be filled manually, according to a well log data with automatic averaging over a given layered model or automatically according to lithologic column and user templates.
  • Planned or actual treatment schedule is filled manually, or from a user template or with an interactive process of defining stage after stage on a realtime plot for each fluid and proppant.
  • Convenient graphs make it easy to compare simulated and actual data, and convenient editing tools for the geomechanics and leak-off tables make it easy to adapt the geomechanical model to the actual results of mini-fracturing analysis.
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Test Injection Analysis

RN-GRID implements most standard diagnostic injection analyses, accepted in the industry in a most convenient way. We tried to make sure that engineers had to perform as few unnecessary actions as possible with their typical injection analyses workflow. Our supported analyses include:

  • Minifrac Analysis
  • Step Rate Test Analysis (SRT)
  • Step Down Test Analysis (SDT)
  • Horner Analysis
  • Nolte Analysis
  • Nolte-Smith Analysis
  • Log-Log Analysis
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Treatment Data Import

Our treatment data import module allows to import actual treatment data from various text and binary file formats conveniently and quickly. Import settings templates allow to specify data format settings for a specific hydraulic fracturing fleet once and load data from that frac fleet with one click of a mouse button. The visualization and express analysis module allows to mark up imported data, calculate volumes for arbitrary intervals, curve slopes, and redesign curves using built-in or arbitrary Python scripts to solve typical supervising tasks.

Interesting Examples of HF Modeling in RN-GRID

Simulation Speed

RN-GRID simulator is based on the Planar3D model, which is very demanding of computing resources, so we work constantly on the effectiveness of the program code, even though our implementation is already one of the fastest on the market.

Training

The productivity of hydraulic fracturing engineers' work depends on how efficiently they use their main working tool: the hydraulic fracturing simulator. In order to facilitate the implementation of RN-GRID in work processes and increase the efficiency of engineers while using it, regular training seminars and workshops are held.

Our Clients

The main user of the RN-GRID simulator is Rosneft Oil Company — more than 200 licenses have been acquired.

Since March 2018, the Rosneft's internal fracturing service — "RN-GRP" LLC — switched to 100% use of RN-GRID, more than 10,000 successful hydraulic fracturing treatments were conducted with a full design cycle performed in the RN-GRID simulator.

10 oil and service companies, besides Rosneft's subsidiaries, became RN-GRID users.