Drilling Optimization – A Review of Process Changes

Drilling activity in most operations in Russia is a “controlled” schedule of events. This makes the management of change process extremely difficult and challenging should the fundamental well design conditions fail or are no longer applicable. With little or no planned contingencies, recovery is usually difficult with unplanned events. For turnkey projects the general contractor is expected to to bear the cost for unforeseen events if these are not identified within the “project book”. Read more

Estimating Friction Reduction ForCasing Operations in High-Angle Wells in The Arctic Region – A Russia Case History

Casing and liner running and cementing operations in high angle wells with long open hole sections pose seemingly diverse sets of challenges irrespective of location and drilling environment. The fluvial loose formations predominant in the arctic region of Russia and most parts of Siberia  provides more than adequate tests and constraints to modelling, understanding and accommodating the risks associated with such operations as this. This is further complicated with no reliable nor consistent information regarding representative geo-mechanics models or failure plains within the region. Read more

Successful Casing TD Solutions for a client onshore Baltic Sea

First combination run of EzeeGlider centralisers, specially fabricated NaviGATOR Sub and BridgeBUSTER reamer shoe successfully lands  245mm (9 5/8″) casing string from surface to over 3500m (11,118′) with over 65% of the casing string at 60 degrees inclination or more. Geopro proposed a cost effective solution incorporating careful placement of low friction rigid body EzeeGlider centralisers to provide 50% stand-off across the entire open hole section and a NaviGATOR Sub and BridgeBUSTER combination which was specially fabricated for this operation. The result was successful landing of the 245mm casing at the desired depth with the NaviGATOR Sub ratcheting every kelly down 30 – 60 degrees to the right. Read more

Introduction of EzeeGlider® Low Friction Factor Centralisers in Russia

On two wells in the Arctic Region of Russia, Geoproteks centraliser program and recommendations help clients land 245mm (9 5/8”) casing in two high angle and long step out wells. The strings were +.- 5000m and over 5500m long in each well respectively and the latter with about 300m of air column. Both drilling rigs had been equipped with a casing drive system, which was however, not required in both cases. On Well nos.1 with 4800m of 245mm casing string, the effective string hook load at TD was about 105 T whilst on a previous well in the same field with a similar trajectory and well design, the available string weight (hook load) at 4200m was 48 T.

A Practical Approach to Evaluating Drilling Projects

In the past estimating drilling performance or project performance for well engineering projects has been carried out in a combination of ways such as accounting for time based events that eventually result in costs or financial relationships. It is rather unfortunate, but the requirement within the industry still remains the quantification of projects and project costs as a function of cost or financial exposure. Read more

A Practical Approach to Evaluating Directional Drilling Performance

Earlier attempts to establish DD performance using the directional drilling difficulty Index (DDI) proposed by Oag & Williams1 is flawed and difficult to interpret. The philosophy behind the DDI relationship is based on the perception of a sample space. Thereafter a mathematical relationship between the “perceived” variables identified within the sample space was proposed. Read more

Benchmarking Directional Drilling Performance

Traditional performance metrics tend to relate drilling performance to the final cost of the well. Thus, decreasing unit drilling cost is considered a reflection of performance improvements. These benchmarking methods are based on cost exposure as measured by nonproductive time, cost per barrel of oil expected, cost per foot, and cost per 1,000 ft or 10,000 ft drilled.1–4 These benchmarks are difficult to normalize, taking into account other inherent and prevalent factors such as drilling environment, geological formations and their peculiarities, and optimum well production objectives. Read more