At what point does a progressive cavity pump make a better multiphase pump choice over a two screw pump. To describe the performance as well as the thermodynamic behaviour of a multiphase screw pump, also operating at very high gas volume fractions up to 100 %, a new thermoand fluid dynamic model was developed. A solution for profile generation in twinscrew multiphase pumps. Experimental investigation of wellhead twinscrew pump for gas. This boosts your pumping performance even with nonlubricating and corrosive and contaminated fluids. Multiphase production systems multiphase wellhead system 8 purpose wellhead pressure boosting and assisting low pressure producing wells application n boost declining well pressure to buck pipeline pressure. Multiphase concept conventional concept multiphase concept multiphase systems are used successfully worldwide for onshore and offshore applications. It further uses pumped product to provide cooling and lubrication to the motor and to bearings. Study of multiphase flow at the suction of screw compressor. Adiabatic compressible flow is assumed in the circumferential clearance. Although the performance prediction of twinscrew pumps on liquids is well established, the prediction of performance of these pumps on multiphase mixtures presents a challenge. The geometry and rotation of the screws generate a series of closed chambers, which. Twin screw pump with doubleend arrangement and internal timing gears 1.
Thermo and fluid dynamic model of a multiphase screw pump, operating at very high gas volume fractions 1. Ongoing development of screw pump technology will only broaden their use in multiphase, crude oil, emulsion and produced water services. Maximize your margins with our twin screw, triple screw and. Due to the double volute design no axial forces are generated and the pumps are hydraulically balanced. If you want, we can even manufacture custom designs. Pdf vacuum and multiphase screw pump rotor profiles and their. General installation, operation and maintenance instructions. This study is focused on the development and validation of an analytical model to predict the performance characteristics of multiphase flow twinscrew pump for wide range of operating conditions. Pdf performance of multiphase twinscrew pump during the. More demanding service requirements impose challenges on screw pump manufactures to provide higher pressure or flow capability, better wear resistance, improved corrosion resistance and lower leakage emissions. They are designed for running with high gas volume fractions gvf and gas bubbles with up to 100% gas content as well as for capacities of up to 5,000 m.
While power is not the focus of this paper but rather the correct prediction of the ingested and therefore delivered flow rate of the pump, figure 3 does provide a look at the power behavior of these pumps, which. Manufactured in over 80 sizes, their design provides complete axial balancing of the rotating elements and eliminates all metaltometal contact within the pump. First subsea multiphase pump in operation first 3,000 kw 4035 hp pumps world record 1,700 m deepest subsea multiphase pump in operation twin screw and progressive cavity pumps are historically in great demand. Comparison of multiphase pumping technologies for subsea and.
Until this point, screw pump performance had been welldocumented for singlephase flow, but the complicated nature of multiphase flow required some simplifying assumptions. After all, the company, with its headquarters in nuremberg, is one of the pioneers in the field of screw pumps. Bornemann twin screw pumps are selfpriming, double ended positive displacement pumps with external timing gears and bearings. The mp1 is a double suction, twin screw pump designed for continuous service in high viscosity applications where multiple phases are expected. Mimeche abstract by introducing a multiphase twin screw pump as an artificial lifting device inside a marginal gas well downhole for wet gas compression application. Sizing and selection criteria for subsea multiphase pumps a thesis presented to.
Maximize your margins with our twin screw, triple screw. Multiphase flow performance prediction model for twin. Gerald morrison the use of twinscrew pumps for moving fluids is not new technology but its application. Leistritz multiphase pumps design and operation leistritz multiphase pumps are rotary positive displacement pumps based on twin screw pump technology and built in accordance with the requirements of api 676.
Investigation of a multiphase twinscrew pump operating at high gas volume fractions. Introduction a screw pump is a particular type of rotary displacement pumps, in which a number of screws rotate inside a cylindrical housing. Slh4series the standard for hygienic twin screw pumps for food, beverage and more. The design of the mp1 was further refined to provide the highest overall efficiency and lowest operating vibration levels of any multiphase, twin screw pump. When the screws turn, the centrifugal forces cause the liquid phase to separate from the gas phase. Leistritz screwpumpprogram l5series l5ng l5nt general use application leistritz screw pumps of series l5ngnt are five screw single volute, selfpriming positive displacement pumps for low pressure duty, suitable for transport of light abrasive and corrosive, high or low viscous fluids with poor or good lubricity. Experimental investigation of wellhead twin screw pump. The design of the mp1 was further refined to provide the highest overall efficiency and lowest operating vibration levels of any multiphase, twinscrew pump. Thermo and fluid dynamic model of a multiphase screw pump. Surface twin screw multiphase pumps upstream pumping. Multiphase pumps should therefore be designed to be able to adapt to different operating parameters by having a wide operating envelope. Leistritz twin screw multiphase pumps are selfcontained and generally leakagefree. With its unique double case design, it acts inherently as a separator to run multiphase products up to 100% gas void fractions at a wide range of flow rates, pressures, and viscosities. This makes the internal design of a twin screw pump an engineering challenge.
The liquid management system avoids torque fluctuations on the drive shaft during slug flow and renders slug catchers. The twin screw multiphase pump has been studied as an alternative system to substitute the conventional one fluid separation, liquid pumping and gas compression in petroleum boosting. Pdf enhanced multiphase flow predictions in twinscrew. Multiphase pump selection cannot be based solely on one defined operating point main duty point as is common for process pumps or compressors for refinery duties. Experimental investigation of wellhead twin screw pump for. The auxiliary equipment of each one such as conditioning tank and. Pdf multiphase flow performance prediction model for. While power is not the focus of this paper but rather the correct prediction of the ingested and therefore delivered flow rate of the pump, figure 3 does provide a. An important assumption made by vetter and wincek 1993 was that the pump could.
The pump includes two intermeshed screw members for providing progressive cavities for transporting mixed fluids, within a pumping cavity, from a suction passage to a discharge reservoir of the pump housing. The model, which will be presented in this paper, takes the timedependent gasliquid heat transfer, the compressibility and acceleration effects of the multiphase gap flow as well as the. Leistritz pumpen gmbh tems are designed to provide always a minimum liquid flow to the inlet area of the pump in order to maintain a liquid seal between screw tips and casing insert. Obviously, the subsea and downhole multiphase pump applications are the most technically challenging with respect to system reliability. Pdf thermodynamic model of a twinscrew multiphase pump. The variety of uses for bornemann pumps seems to have no boundaries.
Although the performance prediction of twin screw pumps on liquids is well established, the prediction of performance of these pumps on multiphase mixtures presents a challenge. Jun 03, 20 the future of surface twin screw multiphase pumps. It eliminates the need to flare gas at the well site, eliminates local water storage and disposal, and exhibits a small environmental footprint. Test data of twin screw rotary pumps are compared with predictions of performance over ranges of fluid viscosity and intake gas void fraction gvf from zero to 100 percent. A pump is disclosed, including a motor and a pump housing, for pumping mixed gas and liquid. The rotor geometry of these pumps play a crucial role in their performance, but, say cao feng, xing ziwen and shu pengcheng from xiam jiaotong university, it has not been clarified yet.
Principle of operation eccentric screw or progressive cavity pumps are volumetric displacement. The first commissionings of a twoscrew pump on an offshore platform occurred in malaysia shell and the north sea bp. Multiphase pump technology and the environment multiphase pump technology is helping to eliminate harmful emissions of carbon dioxide and methane on oil rigs. Previous investigations of multiphase screw pumps have largely been concerned with the general pumping behaviour of these systems 1. Twin screw multiphase pumps for offshore applications. Cfd simulation of multiphase twin screw pump materials technology. Comparison of multiphase pumping technologies for subsea. The twinscrew multiphase pump has been studied as an alternative system to substitute the conventional one fluid separation, liquid pumping and gas compression in petroleum boosting. It was found that a pcp with a metallic stator is a multiphase pump. For improved reliability and prolonged life, the mp1 design.
The first leistritz screw pump was developed by paul leistritz as main lube oil pump for bearings of steam turbine generator sets. Twoscrew pumps split incoming flow into two equal parts that enter the screws from opposite ends of the pump simultaneously. This study is focused on the development and validation of an analytical model to predict the performance characteristics of multiphase flow twin screw pump for wide range of operating conditions. Twin screw pump tsp and electrical submersible pump esp were compared, and their pros and cons were discussed. The three most commonly used types of multiphase pump on the market are tsp, hap, and pcp and they can all be installed onshore, offshore, subsea, and downhole. Do i really need a sophisticated multiphase system if my gor is 50%. Package description leistritz provides twin screw multiphase pump packages that range in scope from a single pump and motor mounted on a baseplate to complete turnkey packages that include. Until this point, screwpump performance had been welldocumented for singlephase flow, but the complicated nature of multiphase flow required some simplifying assumptions. Multiphase flow performance prediction model for twinscrew pump.
Moineau 1930 defined all basic parameters and concepts. Thermo and fluid dynamic model of a multiphase screw. Nemo multiphase pumps are simple and safe to operate. Pdf a series of rotor profiles for vacuum and multiphase pumps was created to check the suitability of standard screw compressor design. These systems are based on the technology of the double volute twin screw pump. Most of our pumping systems can quickly be adapted to changing production requirements by. A new model is proposed to study the leakage flow in the twin screw pump. Whether you need a simple pump or a complex system, we can supply it. Leistritz multiphase pump systems are in operation worldwide. By 1988 a prototype topside two screw pump logged some 3,500 hours of uptime in an onshore test rig in the uk. Rotary screw pumps have existed for many years and are manufactured around the world.
Also modelling of single and multiphase flow at the suction domain of a twin screw compressor were performed in order to have a. Volume 21 number 2 march 2015 multiphase pumping to. Test data of twin screw rotary pumps are compared with predictions of performance over ranges of. If end users decided to use artificial lift in a well, and if they use a subsurface twin screw multiphase pump, then in most cases, they will not require a surface twin screw multiphase pump. Review of most common and up to date measurement techniques in field of multiphase flow was carried out to determine their suitability and feasibility. The construction material used for the multiphase pump will depend upon its field of application, allowing for dependable operation even at the lowest temperatures. At what point does the sand percentage in the crude oil eliminate the two screw technology from being feasible.
Multiphase pumping in the oil and gas industry is the ability to boost pressure without. Twinscrew multiphase pumps experience a severe decrease in efficiency, even. Pdf the twinscrew multiphase pump has been studied as an alternative system to substitute the conventional one fluid separation, liquid pumping and. Screw pumps, multiphase production systems, machine tools. In oil field applications it is often required to pump oil, gas, and water as mixtures rather than separating the fluid. Slh4series the standard for hygienic twin screw pumps for food, beverage and. Nemo multiphase pumps are dependable even under the most difficult conditions. This means that the flow decrease is small, and sometimes even negligible, when the differential pressure increases. The systems efficiently utilize one pump to boost complete, untreated production flows mixture of oil, gas, condensates, water andor solids through multiphase gathering pipelines. Bornemann twinscrew pumps are selfpriming, double ended positive displacement pumps with external timing gears and bearings. Finally, the experimental results confirm that pcps with metallic stators can be used in production crude oil of high viscosity above 40 cp. This multiphase pump has increased production rates and has several environmental benefits. Capable of handling continuous gas volumes of over 98% as well as 100% slugging, twinscrew multiphase pumps are ideal for multiphase use. Multiphase pumping eliminates the need for separators.
Oct 24, 2017 a 200 hp, 635 gpm capacity multiphase flow twin screw pump was tested with inlet pressure varying from 15 psig to 100 psig at gas void fraction gvf varying from 0% to 100% to validate the model. Itt bornemann twinscrew and multiphase pumps and systems are the ideal solution for tank terminals, food, pharmaceutical and oil production and processing. With their ability to handle large gas volumes gvf along with the well fluids produced. Our two screw multiphase pump systems have been used to pump crude oil in pipelines and on wellpads for over 20 years. Multiphase twin screw pumps are continuing to rise.
A 200 hp, 635 gpm capacity multiphase flow twinscrew pump was tested with inlet pressure varying from 15 psig to 100 psig at gas void fraction gvf varying from 0% to 100% to validate the model. As the pump rotates, the intermeshing of the two screws along with the pump housing form chambers. Our product portfolio includes pumps and systems of all kinds, in nearly all sizes and capacity ranges. Our twoscrew multiphase pump systems have been used to pump crude oil in pipelines and on wellpads for over 20 years. Over time, multiphase pumping has evolved to become a. Leistritz is a manufacturer of engineered products for aerospace, energy, process, marine, oil and gas, petrochemical and pharmaceutical industries specializing in pump systems, machine tools, production technology and turbine components. A solution for profile generation in twinscrew multiphase. The first commissionings of a two screw pump on an offshore platform occurred in malaysia shell and the north sea bp. This means that the flow decrease is small, and sometimes even negligible, when the differential pressure.
Leistritz is the first address when it comes to the application of screw pumps. Obviously, the subsea and downhole multiphasepump applications are the most technically challenging with respect to system reliability. Multiphase boosting wherever a pump is needed, we can deliver it. Pump power consumption obtained in the multiphase testing of the small screw pump is also shown in figure 3. Scott multiphase pumping with twin screw pumps is a relatively new technology that has been proven successful in a variety of field applications.
Test data of twinscrew rotary pumps are compared with predictions of performance over ranges of. Pdf sealflush recirculation in twinscrew pumps is an important function because it serves the purpose of not only cooling the seal faces but also. By 1988 a prototype topside twoscrew pump logged some 3,500 hours of uptime in an onshore test rig in the uk. The flowserve mp1 doublesuction, twinscrew, positive displacement pump was specifically engineered to handle the most.
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