Experimental Investigation of Wellhead PCP for Gas Well Deliquification

2013 ◽  
Author(s):  
Gerald Morrison ◽  
Michael Glier ◽  
Shankar Narayanan ◽  
Jun Xu ◽  
Stuart Scott ◽  
...  
Keyword(s):  
Mechanical Efficiency ◽  
Isothermal Flow ◽  
Water Mixture ◽  
Pump System ◽  
Gas Well ◽  
Interference Fit ◽  
Multiphase Pump ◽  
Test Conditions ◽  
Full Speed ◽  
Process Fluid

A Progressive Cavity Pump (PCP) was evaluated for use as a multiphase pump. The pump is a 576 gpm, constant wall thickness PCP operating with an air/water mixture. Thermocouples were installed along the length of the pump to monitor the elastomer temperature to determine when excessive temperatures were present. Inlet pressures of 15, 30, and 45 psig were considered with pressure rises of 30, 60, 90, 120, and 150 psig. The GVF’s considered were 20, 40, 60, 90, and 98%. It was determined that with the water and air mixture, 98% was the maximum GVF at which the pump could operate continuously. The volumetric efficiency, pump effectiveness, and mechanical efficiency were calculated. The temperature rise across the pump was small, so an isothermal flow was assumed. The PCP investigated has a steel rotor and an elastomer stator that were manufactured with an interference fit. This resulted in volumetric efficiencies above 95% for all test conditions at full speed. This interference fit produces a significant drag on the rotor which is relatively constant at a given speed over the entire operating range considered. This results in the mechanical efficiency being low, 15 to 20%, for ΔP = 30 psig but approaching 60% at ΔP = 150 psi for 0% GVF. The mechanical efficiency decreased with increasing GVF to a low of 28% at ΔP = 150 psi for 98% GVF. The GVF specified here is the actual GVF passing through the pump. If a liquid recirculation system were added to the pump reducing the GVF in the pump, higher efficiencies and the ability to operate at 100% GVF for the process fluid entering the pump system can be obtained.

Multi Objective Optimization of a Multiphase Pump for Offshore Plants

2014 ◽  
Author(s):  
Joon-Hyung Kim ◽  
Him-Chan Lee ◽  
Joon-Yong Yoon ◽  
Kyoung-Yong Lee ◽  
Yong-Kab Lee ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Crude Oil ◽  
Single Phase ◽  
Volume Fraction ◽  
Optimization Technique ◽  
Internal Flow ◽  
Multi Objective Optimization ◽  
Pump System ◽  
Multiphase Pump ◽  
Multi Objective

The crude oil produced from well contains a mixture of oil, gas and water. The existing pump system that uses a single phase pump requires a separator to separate the crude oil. Changing from a single phase pump to a multiphase pump significantly reduces costs because a multiphase pump does not require a separator. Therefore, most wells currently being developed apply the multiphase pump system. In this study, a multiphase pump was designed using a multi objective optimization technique. To conduct research, a base model was chosen and its performance was evaluated through numerical analysis. The design variables and variable ranges were set for the impeller and the diffuser. Based on the selected variables, experiment sets were produced. The experiment sets were also evaluated for their performance using numerical analysis. Based on the performance evaluation results of each experiment set, the optimization model for a multiphase pump was derived using Response Surface Method (RSM). In addition, each model’s performance for multiphase flow was also evaluated according to changes in Gas Volume Fraction (GVF) using multiphase numerical analysis. Furthermore, the internal flow characteristics of each model were analyzed.

The Kvaerner Multiphase Pump System for Deepwater Applications

2001 ◽  
Author(s):  
Ove F. Jahnsen ◽  
John Yardley ◽  
Geoff High ◽  
Brede Thorkilsen
Keyword(s):  
Development Program ◽  
Gas Content ◽  
Modular System ◽  
Pump System ◽  
Multiphase Pump ◽  
Current Test ◽  
System Solution ◽  
Twin Screw ◽  
The Individual ◽  
Pump Inlet

Abstract This paper describes Kvaerner’s prototype subsea multiphase pump system and the DEMO 2000 development program (current test completion date 2nd Q2001). Reference is also made to service proven sub-systems, components and subsea expertise incorporated into the pump module and system design. Availability and reliability consideration together with novel plans for the future is presented. The Subsea Multiphase Pump and motor are packaged into a modular system solution that is readily adaptable to template and manifold configurations and maximises the use of existing qualified components and sub-systems. A guidewireless system is adopted and Kvaerner’s design ensures self-alignment upon installation at simple flowbase interfaces, making it ideal for deepwater applications. Due to the individual 40 tonne weight, and moonpool dimensions, of both flow base and pump module, light monohull vessels can be utilised to execute installation and retrieval. The pump unit is Bornemann twin-screw design, service proven and modified for subsea use up to 2000-meter water depth, driven by an oil-filled Loher electric motor that provides efficient power with corresponding low weight. Some main pump features are flexible operation covering all gas-liquid ratios together with tolerance for slug flow and some sand. Of particular importance, compared to centrifugal pump designs, the twin-screw volumetric arrangement is able to maintain the pressure boost specification independent of gas content at the pump inlet, and without an upstream mixing tank.

scholarly journals SUBSEA MULTIPHASE PUMPING SYSTEM X GAS LIFT: AN EXERGO-ECONOMIC COMPARISON

2004 ◽  
Vol 3 (2) ◽  
Author(s):  
C. Y. Nakashima ◽  
S. Oliveira Jr. ◽  
E. F. Caetano
Keyword(s):  
Offshore Platform ◽  
Production Costs ◽  
Pump System ◽  
Operational Conditions ◽  
Multiphase Pump ◽  
Pumping System ◽  
Artificial Lift ◽  
Study Results ◽  
Twin Screw ◽  
Gas Lift

This paper presents a methodology for an exergetic comparison between two artificial lift systems: a gas lift and a twin-screw multiphase pump system, and a standalone offshore platform. A software (Hysys.Process v2.1) was used to simulate an offshore platform with the artificial lift methods and calculate all properties (including exergy) of the material and energy streams. The twin-screw multiphase pump behavior was simulated with a thermodynamic model developed recently (NAKASHIMA (2000) and NAKASHIMA, OLIVEIRA and CAETANO (2002)). The operational conditions of the PETROBRAS 7- MRL-72D-RJS well operating with cited systems were predicted by an internal study conducted in PETROBRAS (BARUZZI et al. (2001a) and partially published in BARUZZI et al. (2001b)). The comparisons cover the range of 2000 to 2020, the same range adopted in the study. Results show that in general the production costs are lower when the multiphase pump is used. The main advantages of this method over the gas lift is the absence of material (gas) recycle and a better energy management.

Subsea High Boost Multiphase Pump System Development and Applications

2013 ◽  
Author(s):  
Maxwell Cerqueira ◽  
C. Jose de Castro Kuchpil ◽  
Luiz Carlos Tosta Silva ◽  
Carlos Eduardo Maia de Souza ◽  
Leonardo Carbone ◽  
...  
Keyword(s):  
System Development ◽  
Pump System ◽  
Multiphase Pump

Optimum Design Parameters for Reciprocating Pumps Used in Natural Gas Wells

2005 ◽  
Vol 127 (4) ◽  
pp. 285-292 ◽  
Author(s):  
Jeffrey J. Rudolf ◽  
Ted R. Heidrick ◽  
Brian A. Fleck ◽  
V. S. V. Rajan
Keyword(s):  
Optimum Design ◽  
Field Testing ◽  
Design Parameters ◽  
Gas Wells ◽  
Pump System ◽  
Gas Well ◽  
Pumping System ◽  
Liquid Phases ◽  
Reciprocating Pump ◽  
Direct Acting

Experimental and theoretical investigation of a recently patented down-hole direct-acting reciprocating pump system is presented. The technology, (US Patent No. 5,860,795) consists of operating a gas well with gas and liquid phases being produced separately by using the gas phase to power a pump to bring the liquid phase to the surface. This would increase the duration of profitability of many gas wells in North America. Experiments and modeling were used to determine optimum design parameters to maintain flow at a minimum reservoir pressure; an optimum area ratio for the gas/liquid pistons is approximately 40. The effect of friction in the pumping system was predicted to have a small effect on this optimum design. The results of this investigation will now be used to design and construct a prototype for field testing.

Frictional Loss Studies and Experimental Performance of a New Synchronal Rotary Multiphase Pump

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
Xu Yang ◽  
Zongchang Qu ◽  
Yuyuan Wu
Keyword(s):  
Structural Design ◽  
Mechanical Efficiency ◽  
Geometrical Parameters ◽  
Frictional Loss ◽  
Multiphase Pump ◽  
Frictional Losses ◽  
Negative Effect ◽  
Experimental Works ◽  
Theoretical Analyses ◽  
Good Agreement

A new synchronal rotary multiphase pump (SRMP) is presented, which is geometrically simple and easy to manufacture. With the rotary cylinder, the frictional losses between the major components of the SRMP are minimized. Its structural design and working principles are introduced. The mathematic models of the frictional losses at various friction-couplings are formulated. Calculations on the frictional losses and mechanical efficiency are performed for a SRMP prototype, too. Experimental works on the prototype in which crude oil is used as working fluids are conducted to validate the functionality of the SRMP and the established models. The calculated results show that the frictional losses in the SRMP are mainly produced by the friction from bearings and seals. The frictional losses caused by the other part of components occupy less than 13% of the total frictional losses. In addition, the theoretical analyses of the various shaft speeds and basic geometrical parameters reveal that the cylinder rotary inertia exercises a negative effect on the friction at the sliding vane sides. Lower shaft speed and smaller eccentricity-cylinder radius ratio are helpful to reduce this effect. In the experiment, the SRMP is operated at shaft speeds of 400, 600 and 800 rpm respectively. The pressure differences are arranged within 0–2.4MPa. The measured values of the shaft consumption powers are shown to be in good agreement with the calculations. These results confirm that the SRMP is suitable for multiphase transportation and has a higher mechanical efficiency.

Transient Flow Study of a Novel Three-Cylinder Double-Acting Reciprocating Multiphase Pump

2017 ◽  
Vol 139 (10) ◽  
Author(s):  
Yi Ma ◽  
Huashuai Luo ◽  
Tao Gao ◽  
Zhihong Zhang
Keyword(s):  
Gas Flow ◽  
High Efficiency ◽  
Transient Flow ◽  
Volume Fraction ◽  
Petroleum Industry ◽  
Flow Characteristics ◽  
Multiphase Model ◽  
Pump System ◽  
Multiphase Pump ◽  
Working Cycle

In petroleum industry, the stability of multiphase pumping is highly disturbed by the gas' presence with high content and variable working conditions. This paper is focused on studying the whole working cycle of the novel three-cylinder double-acting reciprocating multiphase pump. Based on the theoretical analysis, the method of computational fluid dynamics (CFD) is adopted to simulate the oil–gas flow in reciprocating multiphase pump. The numerical methodology, involving multiphase model, dynamic grid technique and user defined functions (UDF), is used to deal with in the calculation. The transient flow characteristics in pump cavity are obtained, and the flow ripples of reciprocating multiphase pump are analyzed. Furthermore, the effects of different operating parameters, such as suction and discharge pressures, inlet gas volume fraction (GVFi) on the capacity, and stability of pump, are studied. The results could help to develop and optimize the high-efficiency multiphase pump system.

scholarly journals The usage of CAN-Bus messages for engine power determination

2010 ◽  
Vol 56 (No. 4) ◽  
pp. 138-146
Author(s):  
J. Čupera ◽  
T. Šmerda
Keyword(s):  
Can Bus ◽  
Measurement Techniques ◽  
Rolling Resistance ◽  
Mechanical Efficiency ◽  
Moments Of Inertia ◽  
Engine Torque ◽  
Full Speed ◽  
Flat Section ◽  
Engine Power

Determination of the actual power of tractor's engine in the operation can be done by calculation which requires the use of a range of parameters such as coefficient of rolling resistance, mechanical efficiency, the moments of inertia, etc. Their values are usually tabulated and therefore the engine power cannot be determine without simplifying. Another solution is to use the actual engine torque message from the CAN-Bus, which brings a specific value of the actual torque. The aim is to use the current torque to calculate the engine power in the deployment of tractor's set in transport operation. The results show that at a uniform movement of the flat section the engine power reached 73 kW. When driving uphill, the value of the actual power reached from 130 to 150 kW depending on the selected gear. Using the actual parameters of torque makes possible to identify the known full speed characteristics of the current engine without the need for assembly demanding measurement techniques.

Control and Test Technology for Deepsea Multiphase Pump System

2018 ◽  
Author(s):  
Lei Wang ◽  
Dan Shen ◽  
Zhixiang Liu ◽  
Peng Zheng ◽  
Zaiming He
Keyword(s):  
Pump System ◽  
Multiphase Pump ◽  
Test Technology
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