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Drill Curve Generation and Analysis
03 April 2020
General question to the group; I've been downloading Pason (Drilling Depth Data) for the last 20years and then plotting it in Excel.

There has to be a better way to simply analyze drill curves and identify Non-Productive time, Pacesetters, Interval Problems Etc?!?! 

Our daily reporting system is CAODC tour sheets and WellView.
3 answer(s)
Drilling Specialist/Well Engineer/Training Consultant
Kingdom Drilling
Total Posts: 503
Join Date: 10/01/05

"There has to be a better way to simply analyze drill curves and identify Non-Productive time, Pacesetters, Interval Problems Etc."

There is! where its not that difficult for an experience person to come up with a far better (true real and evident) graph construct based wells drilling data facts (once revisited)!
Example attached of how we have done and captured this from a set of development wells.

Essentially we dump NPT and metrics used, re-measure review, evaluate and assess the wells evident drilling report data-sets to identify all loss/waste that results. Once identified we then work to further measure  manage and control drilling process project changes in an alternate way. 

What results is a (loss/waste) free targeted days vs depth graphs construct to what is typically presented within the majority of drilling programs. This the key change. We simply set and establish targets that are far higher, with an expectancy to deliver far higher (we reply on Human factor things, People to CAN-Do change and do better.) 

Simplified outline of drilling loss/waste review/analysis vs NPT identification process used/applied as follows.

1. Take existing wells daily report data and clean it up to assure like for like (Because people don't generally report wells (use the same codes) in the same way). 
- Normalise wells further if you want (e.g. use Rushmore well indexing or a similar system etc) to further improve core well data sets. 

2.  Once you have a clean wells data set, Break well's down into more measurable and suitable phases. (as shown in examples attached) 

Note: Most reporting software systems in my experience using standard codes don't do this that well. 
More is also generally better with less.  e.g. if you don't want to measure something why have a code for it? 

3. Remove significant lost time events (some of these will be recorded as NPT often they are not!) from total well time. 

Note: These are major non-injurous accident/incident events that cloud the daily drilling data. They are also according to majority of company policy statement reportable events. Try and find these! 

3. What remains is a more representative set of productive times that one can conduct a more measured operational review to analyse in as much detail as you like (all tripping, drilling casing cement interrogation details so you so wish etc)  Where the devil is in such minor details to absolute drilling excellence.  

4. From within productive time now Extract loss and what you considered as waste (i.e. invisible loss) drilling events. 

5. For waste? you must draw acceptable lines in the sand as to what you believe is evident true and real or not. e.g a contractor told you it will take 2 hrs to rig up his tools on the drill floor it takes 6hrs! Does this get reported as 4hrs NPT? generally not.

6. Do this for each well's phase, drilling, tripping casing cementing logging, abandonment etc. and you have identified all drilling phase job task / loss/waste activity opportunities for improvement. (Note: One will conclude many even the best drilled (loss free) wells!)

7. As illustrated we can see the loss/waste on wells as shown in attachment typically 50%. 

Note: NPT shall only captures 1/3rd of drilling loss/waste and why we concluded decades ago a method as illustrated is the better way.

Identifying drilling loss/waste problems as shown we can  conclude is an easy tasks that a designated competent / experienced drilling person can extract from within nay set of wells drilling data via review / analysis.

The far harder task that follow is how to get all stakeholders involved to act on the physical wells loss/waste evidence and opportunities presented.  Where determining and Evaluating solutions, corrective actions (who when how) to assure a Demmings continuous improvement Plan or a lean construction process etc. 

Rest assured requires project management and leadership excellence with full stakeholder involvement (notably the drilling contractor) to create ta people change environment to act measure manage control and correct in a very different way than is generally instituted in oil and gas today.

What else, please ask. 

I'm sure many others learned in drilling loss/waste reduction to better the curves can chip in. 

That's my cabin fever task done for today.

Wishing you success in your future drilling projects. 
Drilling Specialist/Well Engineer/Training Consultant
Kingdom Drilling
Total Posts: 503
Join Date: 10/01/05
Case study 1 
48 development wells data set analysed in 2002 

NPT as reported 15-22% 

Average  development drilling phase time (spud to TD of wells) 51 days 

Standard offshore non complex deepwater development  wells no major well control, stuck pipe or instability events evident. 

Note:,We the two DSVs (no night person or rig engineer in these days!)  were personally selected to supervise  phase 1 of project in 1996 to deliver 4 wells - several months ahead of operators planned schedule. These were easy wells to drill was our assessment. Operators consistently demonstrated a reluctance to want to learn/change anything. They wanted control in the office. 

Because of this refusal we did not return to phase 2. 

We remained in Norway then headed to Falklands for a 6 well campaign that was delivered 10 months ahead of operators planned schedule 

Note: best wells from the xx data set, delivery circa 23-25 days. There were several real and evident drilling successes!  

Loss Waste free target Drilling capability ( from evident wells data) was 17days. This is real!

34days on average thus evidently identified as lost/ wasted per well ( drilling phases only)

note; NPT captures little of  this! 

2009 we further reviewed and revisited new wells data ( with another operator who was a partner in field)

Key performance change deliverables?  was that rotary steerable had been introduced. New generation MODU’s also now on hire. 

Based on all loss/waste data previously presented evident improvement was expected?  

Well results and trends concluded average well drilling time cost gaps evidently widening further. 

Several factors were concluded and presented to partner why this was evidently so. 

Operator demonstrated a reluctance to change current management strategy employed despite wells evidence that demonstrated little wells drilling delivery improvement.

In summary

Despite all Evidence based loss/waste wells data that existed. 

It remains difficult to get certain Organisations persons to want to change from standard planning to fail measure manage control norms? 
Drilling Specialist/Well Engineer/Training Consultant
Kingdom Drilling
Total Posts: 503
Join Date: 10/01/05
I’ll upload an example of what I Have done in the last 22 years to Identify. 

a wells drilling 
-significant lost time events
- lost time events
- waste ( invisibly loss events) 

Where all you need is a e-copy of a generic clean wells data set of daily drilling reports ( that has been corrected) in a word or excel format that can generally be easily obtained.

The well data is then revisited reviewed analysed with all total loss/ waste identified in a couple of hours.

 This end loss and waste  result ( for a standard offshore wells) should be 2-3x more than than NPT as was reported. In our experience of doing this. 

This the easy part. Ie To generate a loss/ free well from where you can create a loss free days Vs depth chart. 

Delivering to this line then can begin and is the fun part. 

CAN-Do teams of people prefer to set the well  targets higher in this manner. 

Because What shall likely result is people behaviour culture attitudes will generally tune in to deliver far higher. Human factors play a huge part.

Versus the pied pipe method where people copycat days vs depth graph with built in plans to fail same-as. 

What other business would do this? 

Posted by

Jeff Gerlitz


SPREAD Associates

Total Posts: 1
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