Flowstone Energy Services

Mudlogging and Sample Services

FlowStone Mudlogging was developed as an aid to our oil and gas exploration activities. We developed a unique gas agitation and trapping system with the PDC bit in mind. This system created sufficient demand that we increased our units from 1 to 6 full mudlogging units. With 6 identical units, professional personnel and hundreds of wells, we were able to make some predictions on productivity. It is important that you note that many of the wells in this program were not only mudlogged by us, but we also had access to the open hole logs then followed up with the completion supervision. In other words, we had access to all of the information and the completion results of all the mudlog shows. The following interpretation chart and water saturation calculations (productivity estimates) are a reflection of this experience.

FlowStone Gas Chart
Click the above image to view a printable PDF file of the interpretation chart.

Click here for a Sample Vertical Mudlog
Click here for a Sample Compressed Horizontal Mudlog
Click here for a Sample Uncompressed Horizontal Mudlog (large file)

Productivity Estimates

Productivity Estimate from Open Hole Logs
Rw Porosity Rt Sw
Lime %
Productivity Estimate from Flowstone Mudlogs
Percent of Flow Sampled Funnel Viscosity of Drilling Fluid GOR of Reservoir Total Gas from Mudlog Swml
Mud System
Water System %

For funnel viscosities in the 40 to 50 range, the similarity between FlowStone calculated water saturations and Schlumberger calculated water saturations have been remarkable. These calculations are not meant to be substitutes for open hole logs when available but simply timely aids in evaluation of your well.

 In every well in our exploration activity, we have been able to save enough money on rig time to compensate for the mudlogging charge either by not drill stem testing, ordering casing ahead of time or making appropriate decisions on open hole logging companies. If we can be of any assistance to you please do not hesitate to call, we are happy to share our experiences.

Our Primary Experience is on the eastern shelf of the Permian Basin - South of San Angelo, Texas north through Abilene and to Wichita Falls. We have worked through the Midland Basin and as far west as the Central Basin Platform (Monahans and Grand Falls / Royalty) and east to the Ft Worth Basin and North of Ft Worth.

Flowstone Mudlogging Services provides three primary and continuous services during drilling operations:

Measurement of Natural Gas Released from Drilled Cuttings and Formation.
– During drilling operations, the amount and type of natural gas emitted from a formation and its cuttings is the most direct and economical way to indicate hydrocarbons in the subsurface. Open-hole logs are a critical part of the exploration process but the resistivity of open-hole logs is only an indirect approximation of hydrocarbons. Flowstone loggers work diligently to keep gas collection and measurement working properly. All logging units are rigged with working back-up generators so that our gas equipment is not at the mercy of drilling rig electrical equipment.

Rate of Penetration (ROP) or Drill Rate
– Under normal drilling circumstances an increase in the ROP is the first clue that a rock zone or formation may be fluid bearing. The fluid is normally saltwater, oil or gas. Although there are many factors which influence ROP, a formation which has porosity (pore space) and therefore fluid bearing is by its very nature less dense and typically drills faster than the contiguous encompassing host rocks.

Lithology, Oil Fluorescence and “Cut”
– Each cutting sample collected by the drilling rig crew – typically every 10' – is analyzed for proportionate lithology, naturally occurring hydrocarbon fluorescence and solvent derived hydrocarbon fluorescence or “cut.” A brief written description and a graphic representation of these characteristics are conveyed. This service can also be provided for previously drilled wells where samples are intact.