• geological data obtained by physical evaluation of cuttings,
   
• hydrocarbons data obtained from analysis of gases in and out,
   
• surface drilling data (including mechanical, hydraulic and engineering variables, standard safety alarms for gas …) obtained using several high-end sensors and quasi real time enhanced analysis.
   

SLS provide key information to evaluate the well in terms of hydrocarbons ratios, pressure balances, and relative positions of its lithological layers. SLS provide also early warning about dangers to ensure well safety and to prevent formation damages for optimum data acquisition and field productivity. Here are some examples of GEOLOG added-value services to the Clients, amongst many more:

Vibrations: GEOLOG field teams monitor vibrations, torque and drag, stick and slip to anticipate low efficiency or failures of down-hole equipment BEFORE they happen. This triggers an immediate response. It prevents reduced rate of penetration, improper conditions for optimum bit utilization, fishing times, lost-in-holes, as well as the risks and high costs associated with such abnormal conditions.

Cuttings volumes: GEOLOG field teams monitor cutting volumes with such a precision that the wellbore stability is monitored within 5% of the planned drilling activity. This enables the decision-makers to adapt drilling parameters on-the-fly while drilling long BEFORE running casing and cementing, thus improving cleaning of the well bore, allowing changes of drilling conditions to maintain well bore stability, limiting wiper trips, ensuring the integrity of the wellbore and of the well section too.

Flows in/out: GEOLOG field teams monitor fluids flows in and out with both water-base and oil-base mud with such a precision that an influx as small as 5 liters (¼th of a gallon) is detected long BEFORE any rig equipment or drillers can detect anything coming up the hole. This early detection system triggers an immediate response. It keeps well influx to the minimum, hence limits risks. GEOLOG has never experienced a blow-out during 30 years of operations.

Pressures: GEOLOG field teams monitor pressures with such a precision that a minor loss of drill pipe pressure or wash-out is detected within a few seconds long BEFORE any rig equipment or drillers can detect anything in the driller’s cabin. This triggers an immediate response. It prevents fishing times, lost-in-holes, as well as the risks and high costs associated with such abnormal conditions.

Quasi real time enhanced analysis: GEOLOG field experts study the SLS information and correlate them with additional information coming from other service providers such as core analysis, wire line logs, … to identify ‘’recurrent patterns and down-hole signatures’’. In several different cases, quasi real time enhanced analysis permit to quantify and offer the justifications to safely:

• reduce or eliminate wire line logging runs of development projects,
   
• geo-steer using gas ratios which identify gas/water/oil contacts,
   
• drill at-balance when the down-hole differential pressure is reduced,
   
• reduce NPT and invisible times with regards to all known areas of improvements such as rotary versus sliding drilling mode, wiper trips, running casing, cementing volumes and waiting times.
   

Quasi real time enhanced analysis require quality controlled information, knowledge of the field specifics, experienced & wise personnel working as genuine team members with the Client, and timely reasoning to properly take into account the inherent complexity which each Client and each decision-maker is facing to develop a field.