Lag is the first function for WellSight Data.

 The most advanced data recording and gas analysis is of little value if it can not accurately correlate formation characteristics to depth. Where it's from is just as important as what it is.

 This simple fact seems not so simple, even today.

 A rule of thumb like "One minute per hundred feet." is widely used in the Permian, for instance. This however is virtually never the case. 

 This rule makes no allowance for various pump, casing or pipe sizes, off bottom events or the pumps changing speed or even stopping. 

     Time alone is simply not good enough   Some systems allude to their ability to reliably detect gasses, but do not "lag" at all. Many are just  gas detectors, not intelligent logging systems.

 They call this real-time logging, in that they record the foot being drilled and the gas at the surface simultaneously. As if where that gas is actually from is immaterial!

 Our advanced data base modeling allows very precise annular velocity and equivalent circulation density calculations at frequent intervals.

 Equally precise pump characteristics allow us to track each sample to the surface. Each interval is tagged with its drill status so that upon arrival we know the exact circumstances of its origins and its journey to the surface. 

 This level of care in the design of our Data Center    promotes a new standard of formation evaluation and hydrostatic balanced drilling for increased formation integrity and production.

                     The Lag Conveyors.

  In theory we have two "conveyors" bringing samples to the surface.

 There is the "physical conveyor"; Basically the annular volume and the action of the pumps upon it.

 And there is our "virtual conveyor";  A detailed digital model of the wellbore, its casing, pipe geometry and  the pumps' characteristics.

 When the "physical conveyor" starts, stops, speeds or slows at connections, surveys, etc., so does our virtual model, accurately tracking very small volume "packets"  to the surface (generally several to each foot). We also allow for and control  the sample line volume . This keeps the gas data in sync* and prevents common log errors such as an absence of gas around the connections often "edited" out, but not corrected. 

 Lag errors cannot be corrected after the fact, but   prevented only by very carefully selected design elements. 

 Our data curve integrity is not compromised.  We produce gas curves that very closely correlate to lithlogy and drilling dynamics through the active extraction of gas samples and precise modeling of the lag conveyor.

          It's a difference  easily seen on our logs. 

* Careful tracking of on and off bottom events allows only "drilled" events in the gqas curve.  Pressure differentials during off bottom events ( connection gas, trip gas etc.) are recorded and analyzed for formation balance.