Leading Design Solutions for Well Decommissioning

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We're here to change the way you do P&A.

Our P&A business delivers products, not consultancy services. Through rigorous data application and comprehensive technical scope, our work revolutionizes our clients' perception of the P&A planning process. 

Our 'Three Steps to P&A' provide a risk-based project framework for all your campaign planning. By deploying our solutions from the outset of your project, you can be assured of a safe, cost-effective strategy with all risk identified, mitigated, and turned to new opportunity.

Our fixed pricing and lifetime product support, right to the cut of the last conductor, means we stay on your team to the end, and at no additional cost.

Our people are dedicated P&A specialists, with extensive experience of all well types in global hydrocarbon environments.

 

We deliver results, even in complex, historic or poorly documented wells, onshore or offshore, in any part of the world.

 

Our work is always compliant with the regulatory requirements of the licensee, the operator, the well examiner, and all national authorities. 

Working with us has consistently resulted in shortened P50 execution expectations, reduced risk and liability, and greater cost efficiency for all our clients.

Are you ready to change the way you do P&A? Take our Challenge and find out.

 

Since 2018

57

Wells

11

Fields

5

Operators

4

Countries

 

Take 3 Steps to Assured P&A.

Assured planning for well P&A begins with a confident geological model which places the construction of each wellbore in context. When the geological and engineering environment of a well is understood from surface to TD, a Basis of Abandonment Design which meets National planning guidelines is required to determine a barrier placement strategy.

Before operational planning can proceed, this strategy must be tested both to ensure that the well itself can no longer act as a vertical escape pathway for hydrocarbons (that it achieves annular containment) and that any commingling of fluids beneath a barrier cannot create new risks when fluids migrate laterally (that the plan achieves appropriate subsurface containment).

The generation of a Basis of Abandonment Design and the two-stage qualification of that design form the basis of our Three Steps to P&A. Geological Engineering Models, prepared for each well in a field or campaign, form a class-leading Basis of Abandonment Design. Our Risked Annular Cement Evaluation (RACE) service qualifies a well for annular containment, whilst our Crossflow Qualification workflows will qualify a field or Petroleum System for subsurface containment. The GEMs represent a P&A Project's Select stage, whilst the qualification workflows represent the Define stage.

Only by undertaking all three steps can a P&A Project maximise both Cost Efficiency and ALARP Risk Management through planning.

3 Steps to P&A TRANSPARENT

Download our '3 Steps to P&A' service flyer (PDF).

Discover your opportunities with the GEM.

Operational safety, the reduction of liability to ALARP, and the identification of appropriate work scope all begin with a Basis of Well Abandonment Design which identifies the widest possible barrier scope, supports engineering decisions on barrier placement and type, and is consistent, replicable and auditable. Described by our clients as 'A Comp Log for P&A', our Geological Engineering Model (GEM) has become the industry standard since its introduction in 2018. Find out more about the technical advantages of the GEM, and how using it as your Basis of Abandonment Design will bring maximum assurance to your well P&A work, in the links below.

A Geological Model

Find out about the technical standards and workflows behind the log-based Stratigraphy, Lithology, Fluid and Pore Pressure and Fracture Gradient Models in the GEM.

An Engineering Model

Find out about the mud, casing, completions, cementation and bond interpretations that are used in the GEM, and explore the drilling incident and performance information that is used to independently validate the geological models.

A complete well P&A Scope

Learn how the geological and engineering interpretations in the GEM are used to identify Flow Zones, Permeable Zones and Isolation Windows with sufficient rock strength to host permanent barriers.

Download our GEM service flyer (PDF).

 

Assure your Barriers with RACE.

Risked Annular Cement Evaluation (RACE) is a probabilistic tool which describes the potential pipe-to-rock bond along a wellbore by risking key well construction and geological ‘Bond Elements’. RACE addresses the need for an objective evaluation of pipe bonding at a proposed barrier location and, for permanent P&A purposes, represents a significant advance on a qualitative stand-alone CBL or cement job evaluation which is typically undertaken only to confirm zonal isolation for a well's production lifetime.

 

RACE provides a tool for critical comparison of CBL results and cement job records, providing a means by which to resolve the common mismatches which often introduce irreducible risk to a barrier design.  

Leveraging the geological and engineering models of the GEM and incorporating our bond log interpretation services, RACE allows quantitative risking of five Bond Elements (Formation Squeeze, Fast Formation, Formation Bond, Casing Bond, and Cement Job) with the result being a Chance of Success (CoS) of casing being bonded to Formation, represented as a continuous curve along the length of the wellbore. RACE is able to quantitatively handle multiple annuli (strings of casing) and partial cement jobs across proposed barrier locations.

 

RACE is designed for use in a workshop environment, where our engineers will work with your P&A team to weight the probability models for experience and operator confidence. 

 

RACE can be used as an objective basis for:

 

  • Proposing a barrier location;

  • Choosing between annular plug (where bond is good) and PWC (where bond is poor) constructions;

  • Identifying cost efficiency by comparing barrier strategies not only in terms of Chance of Success but also in Risked Cost terms;

  • Demonstrating that a P&A strategy will achieve the secure annular containment of hydrocarbons and overpressured brines.

 

Where CBL cannot or has not been run, RACE can still be used to make the best possible objective assessment of bond potential. It is therefore a critical tool for qualifying through-tubing P&A, which in itself can achieve the cost efficiency of rigless intervention.

Download our RACE service flyer (PDF).

 

Qualify your Crossflow for Complete Assurance.

With our solutions for qualifying crossflow, you can be sure that the Combined Isolation opportunities identified in your GEMs are secure.

We are the only service provider with an auditable, repeatable and portable project workflow for assuring crossflow below a combined barrier. Building on the technical strength of our GEM models, your combined isolation strategy is progressively de-risked away from your well locations by three successive modular Solutions: Structural Modelling, Fault Seal Analysis and Cap Rock Qualification. Each solution builds on the previous module to reduce your crossflow liability to ALARP.

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step 1

Structural modelling

Geophysical and Reservoir Engineering Support for Crossflow

We will establish the size (thickness, extent to closure, likely pore volume and cap rock presence) of the new trap created when hydrocarbons crossflow into a shallower permeable rock. We will estimate the volume occupied by any existing hydrocarbons, calculate expansion factors, determine the future hydrocarbon-down-to (new column height) and de-risk lateral spill from the new trap. We will map out any faults and assess the potential for vertical escape from the new trap.

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step 2

Fault seal analysis

Structural Geology Support for Crossflow

Where Structural Modelling (Step 1) has identified faults which might connect the new trap either to higher permeable rocks or to surface, we will undertake Fault Seal Analysis to de-risk vertical escape from the new trap. Permeability juxtapositions across key faults will be assessed by generating appropriate fault triangles, and the seal potential of the fault plane will be de-risked by calculating the shale gouge.

Cracked Rocks

step 3

cap rock qualification

Geopressure and Geostatistical Support for Crossflow

We will undertake Mass Balance Modelling to asses the change in pore pressure between the original hydrocarbon reservoir and new trap (pressure depletion of the existing reservoir and pressure increase in the new trap, proportional to their relative pore volumes). Using the Structural Modelling results, we will ascertain the hydrocarbon column pressure against the new cap rock at its shallowest depth, and qualify that pressure by developing a synthetic GEM PPFG model of cap rock strength at that point. 

For complete assurance, sub-seismic fracturing of the new cap rock can be investigated using our Fault and Fracture Density (FFD) Mapping solution, where the 2D density of structural lineaments is calculated by gridding. When normalized to the result for the original reservoir cap rock, an FFD value of less than 1.0 qualifies the new seal to retain hydrocarbons.

Download our Crossflow service flyer (PDF).