Please see below for the most frequently asked questions about our products and services.  Click the questions you are interested in to see more.

Why use a Cellar Tech Containment Well Cellar?

Cellar Tech Containment Well Cellars substantially improve worker safety as well as worker safety in and around the well cellar.  Systems that provide these kinds of advantages typically add to the cost of the well, however Cellar Tech Containment Well Cellars can actually lower well costs.

How will using Cellar Tech Containment Well Cellars result in lower well costs?

The extensive benefits provided by Cellar Tech Containment Well Cellars result in a significant reduction in operating expenses over the life of the well.  Some examples of potential cost savings are listed below.

  1. Cellar Tech Containment Well Cellars substantially improve safety while reducing environmental liability.
  2. Cellar Tech Containment Well Cellars are sealed and eliminate the pumping of cellars due to groundwater infiltration….this alone will save far more than the cost of the cellar in many locations.
  3. Most wellheads can be accommodated entirely below grade. With the tubing head adapter flange installed at grade, a BPV can be installed and the tree removed allowing for unrestricted pad and rig access.
  4. We receive regular compliments on the worker friendly environment provided by our containment well cellars. Happy wellhead technicians, welders, nipple-up crews, and rig crews result in faster and higher quality workmanship.
  5. Shop fabricating the work surface, base plate, and numerous other features takes them out of the critical path while substantially improving functionality and quality.
  6. Cellar Tech Containment Well Cellars can reduce nipple up time by allowing workers to minimize or eliminate confined space entry requirements.
  7. Designing the cellar to be a permanent “part of the facility” allows the inclusion of useful features not practical with field fabrication. This can generate savings for the Drilling, Completions, and Production Departments over the life of the well.

Is the Cellar Tech Containment Well Cellar patented?

Yes, Cellar Tech hold U.S. Patent Numbers 7637692, 7987904, 8127837, 8485250, and 8256505 for our Containment Well Cellar Systems.  Additional patents are pending.

Are Professional Engineer (PE) certifications available for the Cellar Tech Containment Well Cellar?

Cellar Tech has designs that are PE stamped and available for installation.  We can also develop a PE certified design for nearly any application.

What sizes of conductors and wellheads will work with Cellar Tech Containment Well Cellars?

While Cellar Tech can design a custom cellar for nearly any application, the standard models accommodate API conductor sizes 26” and smaller. Commodity well head equipment from most manufacturers is generally similar in size. The standard models easily accommodate most 13 5/8” 5M or 11” 10M wellhead assemblies while permitting the tubing head adapter flange to be located at ground level.

Will the use of a Cellar Tech Containment Well Cellar improve environmental compliance?

Yes. Some interpretations of United States Environmental  Protection Agency (USEPA) already establish a link between Spill Prevention Control & Countermeasure (SPCC) plans, the Clean Water Act, and Secondary Containment Systems (SCS). The Alaska Department of Environmental Protection recently amended regulations to require the use of SCS compliant well cellars at facilities requiring SPCC plans. Cellar Tech Containment Well Cellars meet the SCS permeability requirements. Other states as well as the USEPA may follow suit.  Other states are following suit and imposing stricter regulations on E&P companies with regards to cellars and soil contamination.  In any case, minimizing or eliminating groundwater contamination is good environmental stewardship.  

Are Cellar Tech Containment Well Cellars difficult to install?

Actually, they are very easy to install. Multiple cellars can be installed in a single day with a three man crew and basic excavating equipment. The following are the basic installation steps:

  1. Install the conductor in the normal fashion.
  2. Excavate around the conductor 3-6” deeper than the cellar.
  3. Prep the bottom of the excavation by spreading gravel or sand. Smooth with a rake and tamp.Download Cellar Tech Presentation
  4. Lower the cellar over the conductor and bed into the sand or gravel. Check final orientation.
  5. Weld the extension ring to the conductor.
  6. Back fill around the cellar with suitable material.
  7. Install cover plate or grating.

Download our informative Cellar Tech presentation (PDF) document for more information and pictures of the process.(Adobe Reader required.)

How long will a Cellar Tech Containment Well Cellar last?

Soil conditions vary by area so it is difficult to predict corrosion rates. However, a hot dip galvanized cellar should remain leak free in excess of fifteen years. Multiple coating options are available that include hot dip galvanizing, metalizing, painting, polyurea coating, and epoxy coating.

What kind of accessories and options are available?

Round Well CellarCellar Tech offers custom design of cellars and accessories to fit any customer’s needs.  There are numerous useful accessories and options that include:

  • Custom Containment Well Cellar Designs
  • Drilling Liner Attachment Ring (prevents fluids from running under the drilling liner if the crew fails to pump it down)
  • Load Bearing Integral Base Plate to Resist Conductor Settling and Broaching
  • Integral Sump and Piping
  • Piping Stub-Outs or Openings for Production Operations
  • Ladders
  • Removable Handrails
  • Well Crash Cages
  • Surface Runoff Extension Ring Prevents Rainwater from Entering Cellar
  • PE Certified Designs for Nearly any Application
  • Sacrificial Anodes (Fixed or Replaceable)
  • Mid Level Work Surface that Minimizes OSHA Confined Space Entry Concerns
  • Additional / Multiple Bar Grate Levels
  • Fluid Level Controllers
  • Wall Openings, Flanged or Otherwise
  • Double Walls w/ Poured Urethane Insulation
  • Anti Buoyancy Port
  • Installation Boxes (Ditch Boxes)
  • Mouse Hole Penetrations
  • Specialty Coatings
  • Custom Rubber Products
  • Well Houses c/w Class 1 Div 1 Compliant Wiring
  • Load Bearing Cover Plates for Pad Drilling Allows for Truck Traffic on Top of Cellar
  • Surface Casing Hangers – eliminate WOC after cementing surface casing
  • Laser Wellhead Alignment and Other Installation Tools

Can the cellar support the entire weight of the casing string?  Will it also support the weight of the wellhead and the BOP stack?

Our well cellar’s structural base plate helps distribute conductor, surface casing, wellhead, and BOP loads.  This is a patent pending feature that helps prevent broaching and settling by acting as a baffle.  The structural base plate is integral with the floor and can support loads from 10,000 lb to 1,500,000 lb.  This allows Cellar Tech to provide a base plate with capacity to suit our customer’s specific needs. For example, the conductor design for BP’s Liberty wells on the north slope of Alaska was very challenging and the structural base plate had to be rated for 200,000 lbs.


If you have any other questions about Cellar Tech’s products or services please contact us today.