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You are here:Westbay Multilevel Well System»Sampling Probes

Westbay System Sampling Probes

A MOSDAX* sampling probe is used to take discrete fluid samples at formation pressure through your multilevel system without repeated purging. Westbay sampling probes allow collection of discrete fluid samples at formation pressure through the Westbay System casing.

How it works:

  • Sampling probe contains a valve, operable from the surface, which is used to control the sampling operation once the probe has sealed around and opened the port valve.
  • Sample containers for collecting fluid samples are suspended below the probe.
  • After a sample is taken, the valve closes, and the sampler and container are brought up to the surface.
  • The sample container has valves at both ends so that a sample can either be decanted to other containers or transported to the laboratory while maintaining formation pressure.
  • Sampling probe also contains a pressure sensor that measures the pressure inside the Westbay well before sampling, the formation pressure before sampling, the pressure during sampling, and the fluid pressure inside the casing after sampling. These measurements confirm that the sampler is operating properly and that the sample was taken from the monitoring zone outside the measurement port coupling.

altWestbay System Product Brochure

 

The Westbay System Implementation Process

Monitoring Well Design

Draw on our knowledge and experience to help you select equipment and develop well designs to meet your technical objectives, borehole conditions and Westbay System capabilities.

We'll start by asking you about your project (objectives, depth, geology, drilling method, etc.) and help you select the best Westbay System components and type of borehole completion method for your particular situation. Our Westbay System casing can be installed in an open hole, through a temporary guide tube or in a cased well. The type of seals (e.g., packers) selected must match the drilling equipment and the expected borehole dimensions and stability conditions. Where packers are not used, monitoring zones can be sealed by backfill.

Field installation

Our on-site technician helps your installation proceed smoothly. We work with your field installation team according to a well-proven process:

  • Approve the monitoring well design.
  • Visually inspect and lay out the Westbay System casing components in sequence.
  • Record the serial numbers for each packer, measurement port, and pumping port.
  • Assemble each casing joint and test the hydraulic seals.
  • Lower the casing into the borehole.
  • Test the hydraulic integrity of the entire casing string.
  • Inflate the packers sequentially from bottom to top, recording the inflation pressure and volume of water used for each packer.
  • Measure fluid pressures at each measurement port to confirm proper operation and check the annular hydraulic seals between monitoring zones.
  • Then QA zones have been added between monitoring zones, pressure measurements in them help confirm packer seal quality.

Maintenance and repair

Westbay System monitoring well components require little maintenance. That said, we recommend that you invest in a comprehensive maintenance, service and QA program for the portable measurement and sampling equipmentfor good QA of monitoring data and to support their continued reliable operation. Our maintenance programs can include annual recalibration of sensors, parts replacement, and priority response when you require repairs.

Operator training

We'll train your field operators to meet our high standards and yours. We provide training in all aspects of operating Westbay wells, including:

  • Pressure profiling—with pressure probes or sampling probes.
  • Sample collection using a Westbay sampling probe and accessories.
  • Using pumping port open/close equipment and any pump supplied, if you plan to carry out purging.
  • Hydraulic testing using pumping ports.
  • Deployment, programming, downloading, and recovery of automated data acquisition equipment.
  • Operating procedures, QA checks, and routine equipment maintenance in the field.
  • Upon successful completion of the training, you'll receive a certificate as well as comprehensive equipment manuals to guide you along the way.

QA testing and review

Our technical services staff can also advise you on quality assurance testing and evaluation and, upon request, will review your data to verify that your equipment is operating properly.

Trust us to help you choose and implement the best combination of instrumentation and operations to meet your unique groundwater monitoring needs.

Westbay System casing is available in two sizes:

Westbay55 (55 mm ID): Install larger diameter casing deeper, providing you greater flexibility and upgrade potential.

Westbay38 (38 mm ID): Functions like Westbay 38 but with a smaller diameter.

Operational capability

Variation of system size and material of construction provides operational capability ranging to depths of greater than 1,200 m (4,000 ft) in boreholes or wells ranging in size from 76 mm (3 inches) to 160 mm (6-1/4 inches) and larger. Varying well completion methods are available to meet specific project requirements and/or hydrogeologic environments.

Operating specifications can vary considerably from project to project. We can help you to choose the system that best meets your requirements.

Casing Systems

 
MP38 Westbay
MP55 Westbay
Other Systems
Overall System Design:
     
Casing valved ports
yes
yes
 
Bundled standpipes
   
yes
In-situ measurements
yes
yes
 
Surface measurements
   
yes
Measurement:
     
Pressure
yes
yes
yes
Temperature
yes
yes
 
Conductivity, pH, Redox, DO
 
yes
 
Shut-in zone
yes
yes
 
Sampling:
     
No purging required
yes
yes
 
After purging
   
yes
Testing:
     
Hydraulic Testing
yes
yes
 
Shut-in zone
yes
yes
 
Sealing well/casting:
     
Packers
yes
yes
yes
Backfill
yes
yes
yes
Specifications:
     
Inside Diameter (mm)
38
55
Depends on the system
Max. Depth (m)
1000
1350
Depends on the system
Max. Number of levels
Unlimited
Unlimited
Depends on the system