Serva Mixing Systems

Serva mixing systems are available in the following forms:

• Kit, mixing system for installation by customer on their unit
• Complete stand alone mixing system
• Complete mixing and pumping system (skid or trailer)

Kit form for installation in a customer’s new built unit or rebuilds

SERVAgroup is very interested in the successful use of their mixing systems.  To that end, we have certain requirements of the system in which it will be installed.  The following identifies the system components and performance requirements:

A. Installation Requirements For Mixing System Kits

Components

• Mixing tub High-energy mixer
• Cementing metering valve
• 5x6 recirculation centrifugal pump
• 5x6 boost (transfer) centrifugal pump
• 2x3 or 3x4 mix water centrifugal pump
• Agitating system

B. System Requirements

• Mixing water:
  • 300 gpm minimum @ 120 psi, 150 psi shut-in pressure
  • 425 gpm maximum @ 120 psi, 175 psi shut-in pressure

• Recirculating slurry pump requirements:
  • 19 bpm min. w/ water @ 40 psi with 60 psi shut-in pressure (The minimum is assuming that the recirculation is dedicated to mixing and is not used for boosting the downhole triplex pump)

  • 25 bpm max. w/ water @ 40 psi with 75 psi shut-in pressure

• Boost (transfer) pump requirements:
  • This pump is optional but recommended for single triplex pump downhole pumping systems.  It is required for all double pump cementing systems.  The mixing system requires a minimum recirculation flow for effective mixing.  The minimum flow required is 16 bpm while testing with water.  If the recirculation pump is used to boost the downhole triplex pumps as well as provide recirculation flow for mixing, downhole pumping rates higher than 5 bpm will not leave enough energy for mixing.  Another reason to include a dedicated boost pump in the system is that the pressure requirements for boost and mixing are often different. When mixing 16.4 ppg density slurry, the recirculation pump pressure can be well over 60 psi whereas the need for boost is probably no more than 30 psi.
  • Recommendations for boost: (note: The recommendations for boost pump are the same as the recirculation pump.  This is due to the ability of the boost pump to be used as the recirculation if a problem occurs with the primary recirculation pump.)
  • 16 bpm min. w/ water @ 40 psi with 60 psi shut-in pressure
  • 22 bpm max. w/ water @ 40 psi with 75 psi shut-in pressure

The following drawing illustrates a typical installation.

 II.  Mixing systems

A.  Model ACS-II 160 Density Automatic Control Mixing Skid

INTRODUCTION

Model ACS-II 160 Density Automatic Control Mixing Skid developed by Serva is an accurate computer controlled cement mixing system. The computer auto control design provides easy operation and maintenance. Its successful cementing applications in the world offshore and inland oilfields have proved it an idea equipment to serve your cementing jobs. The Model ACM-II 160 Density Automatic Control Mixing Skid is registered with certificate of patent.

1. COMPONENTS

Model ACS-II 160 Density Automatic Control Mixing Skid consists of the following components:

• (1) 6 BT 5.9 Cummins Diesel Engine 160HP/2600RPM
• (1) Power Take-off 
• (1) Hydraulic System
• (1) Mixing System, High Energy Mixer
• (1) Air System
• (1) Lubrication System
• (1) Power Supply System, 220V AC / 24V DC
• (1) ServaACM Computer Control System
• (1) Skid Frame and Console System

2. GENERAL SPECIFICATION

B.  Model ACS-II 160 Density Automatic Control Mixing Skid with mixing water tank

INTRODUCTION

Model ACS-II 160 Density Automatic Control Mixing Skid with mixing water tank is an accurate computer controlled cement mixing system.  The computer auto control design provides easy operation and maintenance.  Its successful cementing applications in the world offshore and inland oilfields have proved it an idea equipment to serve your cementing jobs.  The added water tank allows measurement of mixing water and gives a safety factor for interrupted water supply.

Model ACS-II 160 Density Automatic Control Mixing Skid with mixing water tank

1. COMPONENTS

Model ACS-II 160 Density Automatic Control Mixing Skid consists of the following components:

• (1)   6 BT 5.9 Cummins Diesel Engine 160 HP/2,600 RPM
• (1)   Power Take-off
• (2) Hydraulic System
• (2) Mixing System, High Energy Mixer
• (2) Air System
• (2) Lubrication System
• (1) Power Supply System, 220V AC/24V DC
• (2) ServaACM Computer Control System
• (2) Skid Frame and Console System

2.  GENERAL SPECIFICATION