Petris’ Casing Stress Check was created primarily to perform casing verifications, such as comparing the resistance of a casing column design to physical stresses which the column is likely to experience. With Casing Stress Check, a wide spectrum of potential stress factors can be evaluated.  Rules for calculating stresses can be stored in a customized profile, ensuring that your team addresses and adheres to your company’s policies.

With the prevalence of 3D technology and deep, complex offshore wells, designing safe and economical casing profiles has become more challenging. Casing Stress Check handles a wide variety of casing issues for directional wells along with surface and sub-sea well heads.  It applies conservative criteria to conduct stress analysis and provides flexibility to meet your organization’s customized needs.

By utilizing Casing Stress Check, engineers can analyze constraints and stresses based upon the formation pressure profile and shoe positions and then verify each casing string against user-specified minimum design factors.  It models burst and collapse, including uniaxial biaxial analysis and performs real gas law analysis for internal burst load modeling. 

Casing Stress Check evaluates axial load and bending effect in curved sections.  Formation fracture gradients are calculated according to predefined lithotype. The model determines casing shoe positions and then analyzes kick tolerance, choke margin and differential pressure according to the shoe position. The appropriate casing or tubing is chosen from an extensive database.

Wellbore Cementing

For formation pay zones, some of the most serious risks can be created by badly designed cementing operations. Petris’ Wellbore Cementing was developed to provide comprehensive analysis of complex phenomena that can occur during the multistage fluid placement in a wellbore. And while Wellbore Cementing was originally designed to address cementing issues, this module has the agility to be applied to any multistage fluid pumping operation in a wellbore.

Wellbore Cementing enables the well-recognized U-tubing phenomenon, known as free fall, to be addressed in addition to ECD and bottom-hole pressure. By applying Wellbore Cementing in the planning stage, a wide range of potential problems related to formation breakdown and low to no returns can be avoided, saving your company time and money.

With Wellbore Cementing, your organization can model direction wells.  This highly flexible program has the versatility to handle 20 different tubing and wellbore sizes.  It can manage up to 20 fluids which can be pumped at 10 different rates, including shut-in periods.

Among the calculations that can be performed with this model are free-fall length, dynamic injection pressure and pressures experienced by the wellbore during the cementing operation.  This program also checks casing burst and collapse pressure at variable choke pressures and models reverse circulation.  In addition, Wellbore Cementing predicts return rates, minimizing the risk of formation breakdown. Wellbore Cementing allows your team to model cement placement by addressing all of these challenges…with accuracy, speed and confidence.

Casing Wear

Casing Wear represents a unique, powerful engineering model to calculate and monitor the progression of wear caused by rotary contact of drillpipe with downhole elements, including casing and riser. This module originally was developed under the sponsorship of the groundbreaking joint industry project known as DEA-42 – Casing Wear Technology.

Using Casing Wear, your team can accurately predict the location and magnitude of wear in casing or riser strings as well as flex joints for both onshore and offshore geometries during field operations.  The module performs sensitivity analysis of the flex-joint offset angle in order to decide the maximum allowable offset angle.

In addition, this tool determines the extent, magnitude and location of the wear along with its impact on burst and collapse pressures.  Casing Wear performs enhanced mathematical algorithms for calculating wear, including wear caused by contact of the drillpipe with casing.

With Casing Wear, your team can simultaneously review two sets of wear history data – current and previous – for easy comparison of change impacts. Among this module’s numerous capabilities are wear vs. depth from casing wear logs, expanded tubular databases and an enhanced wear factor database.  The wear factor can be varied either with casing or drillstring. Casing Wear also analyzes the number and placement of drillpipe protectors.

Centralization Design

For directional wells, proper casing centralization is essential to ensure a reliable cement bonding.  Using Centralization Design, your organization can accurately calculate centralizer spacing for any directional well.

This module considers casing deflection and centralizer properties to predict casing stand-off, centralizer spacing and hook loads to run casing. Centralized Design models 3D wellbores and provides both fixed- and hinged-end casing bending models.

This tool offers the flexibility to create either equal spacing or minimum stand-off designs. It can be used for both centralizing and tripping in operations and can handle up to 15 sections of tubular strings and 25 well intervals.

With Centralized Design, whole-well and single-span casings can be analyzed.  This tool, which features a tubular database, permits the combination of spring-bow and rigid centralizers.

Torque/Drag for Liner Cementing

With more long-reach directional wells being drilled, tubulars are exposed to much greater torque and drag.  Torque/Drag for Liner Cementing is recognized as a premier engineering program to compute torque and axial load on a drillstring during liner cementing operations.

Excessive and potentially risky torque loading can happen when cement is in the liner and has not yet flowed around the liner shoe.  This situation can result in a damaged rotary and/or reciprocation liner hanger and can prevent rotation and/or reciprocation of the liner. 

Using Torque/Drag for Liner Cementing, three types of centralizers can be specified for each liner section.  This model can import casing data directly from an online database; this tool is compatible with Microsoft. 

Torque/Drag for Liner Cementing enables your team to simulate cementing procedures by showing the motion of fluid dynamically with various torque and drag loads.  This model provides graphs and tables to describe torque and tension loads along the casing string at any time; these graphs and other data can be exported to disk files and Microsoft Office reports for easy sharing with other team members.  In addition, Torque/Drag for Liner Cementing performs sensitivity analysis for all controllable parameters.

Advantages to Your Company

• Enables your team to execute decisions on casing strings, seating depths and cementing with ease, speed and confidence
• Delivers tools that are among the most advanced, efficient and accurate in the market
• Optimizes drilling performance by enabling avoidance of formation breakdown and low to no returns
• Offers flexibility to simultaneously review two sets of wear history data – current and previous – for easy comparison of change impacts
• Imports casing data directly from an online database; compatible with Microsoft
• Provides graphs and other data to describe torque and tension loads; can be easily exported to other disk files and Microsoft Office for easy sharing

Features

• Handles a wide variety of casing issues for directional wells as well as surface and sub-sea well heads
• Applies conservative criteria for conducting stress analysis along with flexibility to meet your customized needs
• Calculates and monitors progression of wear caused by rotary contract of drillpipe with downhole elements
• Analyzes a variety of stresses according to surface, intermediate and production conditions
• Models burst and collapse, including uniaxial and biaxial analysis
• Performs real gas law analysis for internal burst load modeling
• Considers casing deflection and centralizer properties to predict casing stand-off, centralizer spacing and hook loads
• Enables your team to simulate cementing procedures by showing the motion of fluid dynamically with various torque and drag loads
• Includes expanded tubular database and enhanced wear factor database