CD-1400 Centrifugal D-gasser

The M-I SWACO CD-1400 Centrifugal  MuD D-gasser unit provides an  innovative and space-saving solution  to degassing problems. The D-gasser  units use a patented, centrifugal-force  system rather than conventional  vacuum or impact systems. M-I SWACO D-gasser units exert  centrifugal force to the mud, multiplying  the force acting on the gas bubbles to  increase buoyancy and release. The  increase in buoyancy accelerates the  bubble-rise velocity. As the bubbles  rise toward the surface, they escape  the mud and are further broken down  by flow turbulence. The freed gas and the gas-free mud are  then separately discharged as desired.

Features and advantages

• Removes entrained gases. The Centrifugal D-gasser units  remove all of the entrained gases from  the drilling fluids in the return flow  by using high-speed centrifugal force
• Reduces potential blowouts. The removal of entrained gases,  including H2S and corrosive oxygen,  from drilling fluids reduces the threat  of dangerous and costly blowouts  caused by recirculating gas-cut mud
• In-tank mounting.  Easy-to-install, in-tank mounting  virtually eliminates the need for  rig-floor space
• Energy efficient.  System requires less energy to  operate with UL-approved, 25 hp,  explosion-proof 230/460 VAC  3-phase 60 Hz motor
• Self-contained. The unit is complete with centrifugal  cylinder unit, screens, electric motor  and mount
• High performance. Provides lowest hp/GPM throughput  ratio, generating up to 1,000 to 1,300  GPM (4,164 to 4,921 L/min), depending  on operating conditions

Compact Vacuum D-gasser

Process overview Gases are entrained in drilling fluids  from the wellbore during normal drilling  operations as well as during “kicks” or  well-control situations. These gases  present safety hazards and create  operational problems when gas-laden  fluid reaches the surface. Degassing  is accomplished at the surface by  one of two methods (1) atmospheric  separation or (2) vacuum separation. The simplest form of atmospheric  degassing occurs naturally in the  surface mud tank system. As the  mud flows over the shale shakers  and through the pits, gas bubbles will  form in the mud and escape to the  atmosphere. In event of hazardous  gases being present, it is desirable  to localize the point where gas is  released from the mud by installing  a vacuum-style degasser. Vacuum-style degassers are installed  in the first compartment downstream  of the sand trap and upstream of any  centrifugal pumps. Vacuum degassers  work by removing entrained gases  from the drilling fluid by exposing the  fluid to pressures well below ambient  atmospheric pressure.

Features and advantages

• Fiberglass leaves eliminate corrosion;  reduce repair and maintenance costs
• Large Cleanout Port allows  easier access for cleaning inside  of D-gasser
• Large surface area allows gas  entained in mud to be released  effectively
• Interchangeability of many of the parts  with the Horizontal D-gasser allows  use of existing inventory parts
• Same field-proven vacuum pump as  Horizontal D-gasser
• Short footprint can be installed in  smaller spaces

Horizontal D-gasser

Introduced in 1951, the M-I SWACO  D-gasser* has performed reliably  on over 200,000 wells and earned  its reputation as the standard of the  industry. All M-I SWACO D-gasser  units are designed to remove virtually  all entrained gases, including H2S and  corrosive oxygen, from drilling mud.  This reduces the threat of dangerous  and costly blowouts caused by  recirculating gas-cut mud. With its  smaller footprint, 42 x 60.7 in. (1,066.8 x  1,541.8 mm), the vertical model is ideal  for confined-space applications.