Designed for coil tubing, drilling, flow-back, snubbing, and blowout applications, Schooner Petroleum Services' hydraulically-operated positive-sealing chokes are available individually, combined with panels, or integrated in manifolds. By allowing the pressure parameters to be changed to meet production requirements, these single and dual chokes are capable of handling working pressures of 5,000 to 20,000 PSI.
Also available in positive and adjustable styles, Schooner Petroleum Services' chokes are manufactured with orifice sizes ranging from 1 1/2" to 3" and inlet/outlet flanges from 1 13/16" to 4 1/16".
The choke gate and seat are constructed of high quality tungsten carbide for maximum wear resistance. Schooner Petroleum Services has combined the erosion resistant concentric flow pattern found to be the least turbulent in downstream flow with a positive sealing gate and seat.
For safe, reliable well-control, Schooner Petroleum Services' choke control system includes one or two hydraulically operated chokes, two pressure transmitters, two pump stroke counter lines and a control panel. The control panel contains all gauges and the pump stroke counter. All hoses to connect the system are provided and are steel-reinforced for greater safety and reliability.
Digital Choke Position Indicators, available on Schooner Petroleum Services' chokes, very accurately display the exact choke position in percent. This is extremely important when drilling under balanced pressure, circulating out a kick, or flowing back after fracture. An independent analog output with an industry standard interface is available for other vendors well site information systems to connect to.
High Operating Force
Large hydraulic piston has more than 10,000 lbs. of force to control the choke.
Large Body Cavity
Buffer cavity gives a more uniform flow through the gate and seat.
Positive Seal
Gate and seat seals inside the seat to give a positive shut off. Gate and seat are reversible to give these parts extended life.
Abrasion Resistant Wear Sleeve
Downstream wear sleeve provides protection from erosion in the most turbulent area of flow.
| 10,000 PSI Working Pressure Body Approximate Weight = 800 lbs. |
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| Size A&B | X | Y | C | Z |
| 2-1/16" (10M) | 14-5/16" | 15" | 30-3/4" | Y+ 18-1/2" |
| 2-9/16" (10M) | 14-5/16" | 15" | 30-3/4" | Y+ 18-1/2" |
| 3-1/16" (10M) | 14-5/16" | 15" | 30-3/4" | Y+ 18-1/2" |
| 4-1/16" (10M) | 16-5/16" | 17-1/2" | 30-3/4" | Y+ 18-1/2" |
| 1-13/16" (10M) | 14-5/16" | 19-3/16" | 30-3/4" | Y+ 18-1/2" |
| 15,000 PSI Working Pressure Body Approximate Weight = 900 lbs. |
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| Size A&B | X | Y | C | Z |
| 1-13/16" (15M) | 15-3/4" | 20" | 34-1/2" | Y+ 18-1/2" |
| 2-1/16" (15M) | 15-3/4" | 20" | 34-1/2" | Y+ 18-1/2" |
| 2-9/16" (15M) | 15-3/4" | 20" | 34-1/2" | Y+ 18-1/2" |
| 3-1/16" (15M) | 15-3/4" | 20" | 34-1/2" | Y+ 18-1/2" |
| 20,000 PSI Working Pressure Body Approximate Weight = 1,500 lbs. |
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| Size A&B | X | Y | C | Z |
| 1-13/16" (20M) | 19-1/8" | 23" | 34-1/2" | Y+ 20-3/4" |
| 2-1/16" (20M) | 19-1/8" | 23" | 34-1/2" | Y+ 20-3/4" |
| 3-1/16" (20M) | 19-1/8" | 23" | 34-1/2" | Y+ 20-3/4" |
Responding to requests by customers to help reduce damage to downstream equipment caused by solids, Schooner Petroleum Services has added an additional outlet and modified our current proven design to incorporate a solids removal feature. Affectionately called the Chunk Choke due to its rock catching application, the model C choke comes in with a 2" maximum orifice and can handle working pressures of 10,000 and 15,000 PSI.
Large solids are removed from the flow stream due to differential areas between the inlet and choke cavity. This is the principle behind our original choke design to stabilize flow in the body prior to passing over the gate and seat.
- Manufactured to API specifications
- Hydraulically operated
- Available in 10,000 and 15,000 PSI working pressure
- Available in right or left hand configurations to fit existing manifolds
- Removable inlet / outlet spools
- Patented
The Model DM choke is remotely operated with power from either a coil tubing power pack or a Schooner Petroleum Services' supplied panel, which requires only air.
- Manufactured to API specifications
- Available in 10,000 and 15,000 PSI working pressure
- Worm gear operated
- Up to 1" orifice w/ carbide lined blast joint on single or dual chokes
- Gate and seat change out without complete disassembly of choke
- Manual over ride
- Electronic position indicators
In addition to owning six patents, Schooner Petroleum Services' manufacturing facility has earned API6A, API16A. Furthermore, these devices can be certified for H2S service.