DAN-STM for Enhanced Oil Recovery

EN-FAB, Inc.

3905 Jensen Drive

Houston, Texas 77026

EN-FAB, Inc's  DAN‐STM® steam quality measurement system consists of an orifice meter and a choke arranged in series with the choke placed downstream of the orifice meter.

 

A conventional straight “bean” type choke requires a minimum of 50% pressure reduction to achieve critical flow. The pressure drop requirement is not always feasible, particularly in higher pressure systems. To minimize this difficulty, EN‐FAB Inc. employs a Pressure Recovery Venturi (PRV) nozzle within a conventional type choke body bean. The PRV design reduces the minimum pressure drop requirement to 20% of the inlet pressure.

 

The flow computer uses the orifice equation and Napier equation to solve for these values. By employing simultaneous equations solution method, first one parameter is solved for; i.e. mass rate, followed by using the value in either equation to obtain the other parameter; i.e., steam quality. The resulting values of these two parameters will satisfy both equations. Graphically, this is where the lines for each equation intersect. However, the orifice equation and the Napier equation cannot be used in their pure mathematical form, theoretically determined empirical constants are incorporated in the calculations that give accuracy to the results.

 

DESIGN AND OPERATING DATA

Design Input / Basis of Design

 

(Design Parameters): Fluid : Saturated Steam

 

Design Pressure : 18,500 kPag (2,683 PSIG)

 

Design Temperature : 360 Deg. C (680 Deg. F)

 

Design Steam Flow Rate : 12,700 Kg/Hr (28,000 LB/Hr) MDMT : ‐29 Deg. C (‐20 Deg. F)

 

Design Steam Quality : 30 to 100%

 

Operating Limit Details (Operation Condition)

 

Operating Inlet Pressure : 10,000 ‐ 11,000 kPag (1,450 ‐ 1,595 PSIG)

 

Operating Outlet Pressure : 8,000 ‐ 8,800 kPag (1,160 ‐ 1,276 PSIG)

 

Operating Temperature : 312 Deg. C (593 Deg. F)

 

Nom. Steam Flow (Case 1): 8,590 – 11,399 Kg/Hr (18,939 – 25,130 LB/Hr) [0.672” ID Choke]

 

Nom. Steam Flow (Case 2): 6,709 – 8,902 Kg/Hr (14,791 – 19,626 LB/Hr) [0.593” ID Choke]

 

OPTIONAL FEATURES

Trailer Mounted Dan-STM with custom spool attachment configurations

 

Skid Mounted Dan-STM

 

Solar Powered

 

HMI (Human Machine Interface)

 

4-20 mA outputs for data and process parameters

 

Daily and Hourly reports

 

Trend Data

 

SCADA

 

In-system integration (steam process lines that require steam quality measurement)