ERD
Concepts Corporation

The objective of sustainable well engineering is to define and to develop the framework for successful ERD projects. 

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• Specifying, selecting, planning and delivering the well engineering input for the ERD project from start to finish.

• Developing well engineering techniques and processes tailored to the needs of the customer and the project.

• Defining strategies to optimize the well type, well path and well construction in teamwork with the customer.

• Supporting the implementation of a successful ERD strategy into the well engineering organization of the customer, so that the lessons learned are sustainable imbedded in the well engineering design, planning and execution process.

• Creating conceptual ideas for ERD projects and aiming to improve existing well engineering practices and processes of the customer.

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ERD Concepts conceptual well design options takes into account the full life cycle of the well.

 

The philosophy of the first stage of the ERD-concept is to develop well design options taking into account geology and subsurface hazards, pore-frac pressure  in-situ stress & formation strength and the functional specifications of the well. The approach is underpinned by a detailed offset well review.

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Stage One - Options, Concepts, & Compromises

 

The first stage of the process of developing ERD well design options and concepts comprises:

 

• Trajectory.

• Bottom-up casing scheme based on minimum hole size requirements for completion.

• Casing shoe depths based on pore and frac pressure prediction.

• Open hole size and casing scheme based on upper and lower completion requirement.

• Material of casing, completion, connections and wellhead equipment.

• Mud and cementing.

• Zonal isolation.

• Casing contingency and sidetrack strategy.

• BHAs and logging strategy and requirements.

• Work-Over and abandonment.

• Architecture and well construction process.

• Rig specifications and minimum equipment requirements.

• Evaluating time & costs of the design options and concepts.

 

Stage 2 - Optimization

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Based on proposed design options; optimization, risk assessment, time & cost analysis optimization and selection process will be applied selecting the base concept going forward with for detailed design and planning.

 

The objective of the process of optimizing the trajectory of the selected concept is to find the correct balance:

 

• Reservoir productivity.

• Wellbore stability.

• Casing wear.

• Hole cleaning.

• ECD management.

• Torque and drag.

• Drill string buckling criteria and limits.

• Casing and liner deployment strategy.

• Anti-collision criteria.

• Time & costs.

 

Stage 3 - Detailed Design & Planning

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The detailed design stage is hinged on the approved pore and fracture pressure predictions and the agreed well concept based on an optimised trajectory design.

 

The detailed design process comprises technical specifications of well and the drilling program:

 

• Tri-axial casing and completion design calculations based on load cases reflecting the whole life cycle of the well.

• Kick tolerance.

• BHA and drillstring design.

• LWD and surveying tools & strategy.

• Hole cleaning, equivalent circulating density and swab/surge analysis

• Determine buckling criteria and limits of drill string, BHA, casing, liner and completion.

• Friction reduction strategy.

• Mud and cementing design.

• Clean-out strategy and fluid program for completion phase.

• Determine pressure test criteria and values.

• Formation integrity test strategy.

• Specifying and selecting temporary and permanent installed wellbore equipment.

• Detailed drilling program including written work instructions.