Fid gas chromatograph
The FID gas chromatograph used by Sperry sun logging systems is The Baseline model 1030A.
The Chromatograph has a twin column and is fitted with a flame ionization filament. It is programmable and all functions are controlled through an On-Board microprocessor. It has a selectable signal attenuation which allows for a great degree of accuracy throughout a range of hydrocarbon gases encountered.
Full analysis of a sample gases from C1 through to C5 requires approximately 8 minuets with off-line type, and it takes 3 minuets with the On-Line type in which the carrier air is replaced by hydrogen.
The microprocessor units enables the operator to program the shorter of the two columns (The cut-off column) to choose the required level of analysis. After passing through this column the sample is directed through the longer column to separate the components.
The facility to program an automatic attenuation is useful where one type of hydrocarbon may be present in large amounts and another in small amounts.
The system can be programmed for manual (injection) or automatic operation (direct from gas trap) with an optional of auto-recycle. Before each cycle the system performs an auto-zero function.
The principle of operation is the same as with the FID gas detector, but where the gas detector is always fed with a mixed sample, the chromatograph takes a 1CC sample and separates the mixture to its components by passing through a column. The separation takes place inside the column according to the different elution times due to the varying absorption and adsorption rates of the component gases as they are pushed through the column.
The sensitivity is 1 ppm but, in normal operating practice a sensitivity of 10 ppm is assumed. Normal programming is for C1, C2, C3, C4-iso, C4-normal and C5’s.
In the case of the Off-Line chromatograph the output is displayed on a time driven wide track chart recorder, giving a permanent graphical record of each cycle.
In the On-Line chromatograph the FID signal is completely processed by the LS-2000 computer system and the output of each cycle is printed out on a computer printer as well as being stored in the computer buffer as records. These stored records can then be transferred to the PC and plotted on various logs forms.
9.Sensors
Sensors specifications
The nature of the Logging system data acquisition systems allow complete flexibility in the choice of sensor inputs. The number of analogue sensors can readily vary with up to 64 inputs available. This means that additional sensors to those outlined below can be added upon request with minimal effort.
Standard sensors list:
Depth wheel
Hook load
Rotary speed
Torque- Electrical..or.. mechanical
Standpipe & choke Pressure
Pit volume- delaval
Flow out - paddle
Pump stroke
Mud temperature In/Out
Mud density - differential; In/Out
Mud conductivity
Optional sensor list
Mud density - resonant
Flow out - magnetic inductive
Pit volume - ultrasonic
Quantitative Fluro Techunique; QFT
Quantitative Gas Measurments; QGM
Dissolved H2S; Mud Duck
Wirline depth
Redact potential
PH
Dissolved oxygen
Solids content
Portable Density meter
-DEPTH WHEEL -HOOK LOAD
-PUMP STROKE -TORQUE
-ROTARY SPEED -STANDPIPE & CHOKE
-ROTARY SPEED
- PIT VOLUME
-FIOW OUT
-MUD TEMPERATURE
-MUD DENSITY
-MUD CONDUCTIVITY
-AMBIENT GASES